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Earth Science is a broad spectrum that is concerned with the study of solid Earth, the air that envelops it, and the water that exists on it. It covers physical science and life science. Earth science includes the study of living organisms and their environment. It is studied with the purpose of understanding the past evolution and the features of the Earth and using this knowledge whenever appropriate. There are various branches of Earth Science that includes geology, meteorology, oceanography, astronomy, hydrology, mineralogy, etc. It includes a lot of practical applications that include locating minerals and energy resources present on Earth.
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Key Takeaways: Earth Science, Hydrology, Astronomy, Oceanography, Hydrology, Earth zones, Lithosphere
What is Earth Science?
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Earth Science can be understood as the study of planet Earth. It includes the development of various methods through which we can protect the planet and develop an insight into the natural processes occurring on Earth. It combines the study of physical sciences and life sciences. Life science refers to the study of living organisms and their relationships that include the field of ecology, biology, anatomy, etc. It also studies the celestial neighbours of Earth. Therefore, Earth science includes all the branches of science that deals with the physical components of the Earth and the atmosphere around us.
It includes all the physical processes that take place on the surface of the Earth as well as in its atmosphere. Therefore, it involves all the natural phenomena such as rainfall, hurricanes, storms, drought, floods, etc.
Importance of Earth Science
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Earth science aims to understand the regions that different branches of Earth science cover. It also includes the study of oceans as oceans constitutes seventy one percent of the planet. Earth and the organisms living on it face a lot of issues and a number of challenges that include global warming and climate change. The scientists and the people studying Earth Science play a very important role in solving these problems.
Earth scientists are also trying to develop new sources of energy, metals, and minerals to minimize the effect of climate change. This is done to minimize the threats of disasters such as earthquakes, landslides, volcanic activity, floods, etc.
Earth Science Formulas
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The formula for Earth’s magnetic field is:
B =
Where B denotes the magnetic field of the Earth
Bv is the vertical component of the magnetic field
BH is the horizontal component of the magnetic field
Branches of Earth Science
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There are various branches of Earth Science. Some of them are as follows:
- Geology is the branch of Earth Science that directly studies Earth. It deals with the composition of the Earth, its structures, and the study of the processes of the Earth. It observes what changes have taken place on Earth over the years and geologists work to find the minerals present inside the Earth.
- Meteorology is the branch that is concerned with the atmosphere, and the weather and climate processes. It also studies climate change over time.
- Oceanography deals with the study of ocean and ocean floors with a focus on the processes, organisms, composition, and movement. Most of the surface of the planet Earth is covered with oceans and it is an essential source of food and other important commodities. Oceans also have a major influence on weather and the changes in the ocean that can also cause climate change.
- Astronomy deals with the study of celestial objects and the universe in space. It is important to study these celestial objects as they impact Earth in many ways. For instance, the moon has a strong impact on the ocean tides and the sun also has an impact on weather and climate.
Important Topics of Earth Science
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The six vital topics concerned with Earth Science are:
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Hydrology
It is a topic of Earth Science that is concerned with water and air that is present on or above the surface of the Earth. The study of water present on the surface of Earth and within it is known as hydrology while the study of water froze in glaciers is glaciology, and the study of water present in oceans is known as oceanography.
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Mineralogy
Mineralogy deals with the chemical and physical makeup of the Earth and studies the minerals present in it. It includes geochemistry, geophysics, structural geology, etc.
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Geomorphology
It is a topic of Earth Science that deals with the study of terrestrial surfaces and landforms.
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Astrogeology
It is a topic of Earth Science concerned with the study of the moon, other satellites, and planets. It focuses on the terrestrial features of various planets.
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Geochronology
It studies the geological history of Earth such as the study of age dating rocks and isotopic chemistry.
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Geology
It is the main topic of Earth science that is concerned with the study of Earth. It includes the study of the composition of various materials, the different processes of the Earth, and its structure. It observes how changes have taken place on the surface of the Earth over the years.
Environmental Earth Science
Environmental Earth Science can be understood as the combination of earth science and environmental science. It is concerned with the biological, chemical, and physical components of the environment and the effect they have on humans and other organisms. The Interior of Earth can be classified into various zones such as the mesosphere, lithosphere, asthenosphere, outer core, and inner core.
Things to Remember
- Earth Science is a broad spectrum of subjects that includes the study of solid Earth, the water that exists on it, and the air that envelops it.
- The various branches of Earth Science include hydrology, geology, oceanography, astronomy, meteorology, mineralogy, etc.
- Earth Science combines the study of physical sciences and life sciences.
- Geology is the branch of Earth Science that directly studies the composition of Earth.
- Meteorology is concerned with weather and climate processes.
- Oceanography deals with the study of ocean and ocean floors.
- Astronomy deals with the study of celestial objects in space.
Sample Questions
Ques. Define Earth Science. (3 marks)
Ans. Earth science includes a wide spectrum of physical science and life science dealing with Earth. It also deals with the celestial bodies that are present in or near our solar system and studies organisms through fields of anatomy, biology, ecology, etc. Simply, we can say that all branches of science dealing with the physical composition of Earth and the atmosphere is included in Earth Science. It also studies or observes all the physical processes that take place on or below the surface of the Earth.
Ques. What is Geoscience? (3 marks)
Ans. Geoscience refers to the study of the Earth. It studies the shape and forms of the surface of the Earth, the natural resources available for our use, and how everything in the ecosystem is connected. It includes studying many aspects of Earth such as the atmosphere, lakes, oceans, rivers, glaciers, ice sheets, soil, the rocky interior of Earth and its layers. It investigates the past and current models to get an idea of the future behaviours.
Ques. What are the 4 main branches of Earth science? (5 marks)
Ans. The four main branches of Earth Science include:
- Astronomy: Astronomy refers to the study of the moon, sun, stars, planets, asteroids, comets, and various other celestial bodies. It is the stud of all things in the space and universe lying beyond the atmosphere of our planet, Earth. It makes use of telescopes and various other advanced scientific instruments to study planets and galaxies that are far distant.
- Geology: Geo refers to ‘Earth’ and logy means ‘study of’, therefore geology refers to the study of Earth. Generally, it is further divided into two categories, physical geology and historical geology. Physical geology is the study of Earth’s physical features and the processes that take place on it. Historical geology studies the history of the Earth and how it has changed since it was formed.
- Meteorology: Meteorology is the branch of Earth Science that deals with the atmosphere, climate, and associated phenomena. It aims to understand the atmosphere of the Earth, its structure, and its various processes. It helps in weather forecasts and the overall understanding of the atmosphere.
- Oceanography: Oceanography is the study of the ocean and the lives of animals and plants (aquatic life) living underwater. Oceans are an important part of our ecosystem and therefore oceanography aims to understand this vital resource, its properties, and its history.
Ques. Why studying Earth Science is important? (3 marks)
Ans. It is important to study Earth Science as:
- Earth Science explores natural resources present in our environments such as soil, water, ground, stones, and metals. It explores the surfaces of the land, atmosphere, the water flowing on Earth, and the oceans specifically.
- It helps in understanding the recent changes in the environment to plan the conservation activities accordingly.
- It deals with the natural distribution of resources of energy.
- It helps in identifying various methods and procedures that predict the effects of many natural disasters such as landslides, volcanic eruptions, floods, earthquakes, etc.
- It helps us understand our Earth and its processes so that we can live a quality life.
Ques. Explain Oceanography in detail. (5 marks)
Ans. More than 70% of the surface of our Earth is covered with water. Oceanography includes the study of the ocean and its processes as most of the water on Earth is present in oceans. Human activities have a great influence on oceans such as when the human population increases, the population of marine species are declining as a result of overfishing, global warming, and the toxic contaminants that lead to water pollution. The greenhouse gases cause the thicker ice caps to melt. As a result of this, the water of the oceans warms and expands. This causes the sea levels to increase drastically especially when it is combined with the melting of polar ice caps.
Oceanographers study the vastness of oceans and help us understand the water world. There are many branches of oceanography. The study of processes of the ocean such as ocean currents and waves is included in physical oceanography. Chemical oceanography is concerned with the natural elements present in water and the pollutants.
Ques. What are the two types of forces that change Earth's surface? (3 marks)
Ans. The forces that change the surface of the Earth are the actions of wind and water, which comprises weathering and erosion.
- Weathering is a force of the Earth that destroys landforms and rocks. It changes solid rocks into sediments. Rocks are disintegrated through the processes of weathering.
- Once the sediments are separated from the solid rocks, the sediments move through the process of erosion. The four important forces of erosion are water, glaciers, wind, and gravity.
- Water is mainly responsible for the maximum amount of erosion. Depending on the force of water, they can move the sediments ranging in size from tiny to large.
- Wind moves the smaller particles of rock through the air.
- Glaciers move sediments of all sizes, ranging from extreme large boulders to the tiniest fragments of rock.
- Gravity moves around the broken down pieces of rock downslope.
Ques. What are the various layers of the Earth? (3 marks)
Ans. The different layers of the Earth are:
- The Inner Core is the hottest and centremost layer of the Earth. It is solid and is formed of Nickel and Iron.
- The Outer Core has metals present in a liquid state due to very high temperatures. It is also composed of iron and nickel metals and surrounds the inner core.
- Mantle is the Earth’s widest section. It is formed of semi-molten rock that is referred to as magma.
- Crust is the outermost layer of the Earth where we reside. It is a solid layer of rock that is divided into 2 types oceanic crust that covers water and continental crust that covers the land.
Ques. What is the lithosphere? Explain its significance and composition. (3 marks)
Ans. The lithosphere is the outermost and the most rigid shell of Earth.
- Lithosphere is formed of the crust and upper portion of the mantle.
- It has multiple layers of rock that include sedimentary rocks, metamorphic rocks, etc.
- There are two types of the lithosphere, oceanic and continental.
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