Inside our Earth Class 7 Notes Geography Chapter 2 - PDF Download
The chapter Inside our Earth for the students of Class 7 Geography has a lot of interesting topics that can be used to understand the concept of the Earth’s interior. There are different points of interest such as Rocks found on earth, minerals, the interior of our earth, and so much more. It is really important for the students to have the facts regarding the planet’s interiors since these questions are most likely to appear in the examinations. Students can rely on the Class 7 Geography Chapter 2 notes to get the answers to every single question that they might have.
Class 7 Social Science Geography Chapter 2 Inside Our Earth Notes
Overview of The Earth
Earth can be a very dynamic planet. There are so many changes that are constantly going on, both outside the earth and inside it. There are three different layers that constitute the interior of the Earth. These layers are known as the Crust, Mantle, and Core. Most rocks are situated in the Crust of the earth. Rocks can be classified into three major groups known as Igneous, Sedimentary, and Metamorphic. Most minerals tend to occur naturally and have some physical properties as well as definitely the composition of chemicals. Students need to have Inside our Earth Class 7 notes to completely understand these topics and score good marks.
A Look into The Earth’s Interior
There are various concentric layers that make up the Earth. These concentric layers are inside one another. The Crust is basically the layer that is uppermost and it is the thinnest one of all. The crust consists of 35km of landmasses and just 5 km of the floors of oceans. The constituents which make up most of the continental landmasses on the crust are alumina and silica. Hence, it is known as SiAl. Also, the minerals which make up the ocean masses are Magnesium and Silica. Hence, it is known as SiMa. You can find more details in the notes of Our Earth for class 2.
The layer which is situated beneath the Earth’s crust is known as Mantle. The depth of the entire layer of Mantle is about 2900 km right below the earth. The layer which is beneath the Mantle is known as the core and it is the innermost one. The total radius of the core is about 3500 km. Hence, it is definitely the largest one of the layers. The main materials found in the core are iron and nickel and it is known as NiFe. One of the most important things to know about the core is that it has a very high temperature and very high pressure. Students can find the details in the Class 7 Geography Chapter 2 notes.
Different Rocks And Minerals
A rock can be defined as any particular and natural mass consisting of mineral matter. Rocks are meant to cover up the earth’s crust. There are different sizes, colours, and textures of rocks.
The crust of the earth has a lot of different types of rocks that constitute the entire layer. We are going to classify these rocks into major groups.
In the Inside our Earth Class 7 notes, there are details about Igneous rocks. These rocks are formed after the cooling down of magma. The magma turns solid and forms these types of rocks. Igneous rocks are Primary rocks. Igneous rocks can be classified into 2 types: Intrusive and Extrusive Igneous Rocks.
Intrusive Igneous Rocks: These are the rocks that are formed inside the layer of the earth’s crust due to the magma cooling-off deep inside. One great example of an intrusive igneous rock is Granite. This rock is used to create grinding stones.
Extrusive Igneous Rocks: These rocks are formed on the surface of the earth due to the cooling off of magma instantly after coming out. One such example of an extrusive igneous rock would be basalt. One of the facts states that the entire Deccan plateau consists of basalt rocks.
These are the rocks that are formed after they fall down, hit one another, and crack to form smaller fragments. These fragments are known as sediments and these are transported properly and deposited at a certain location by water and wind. One of the examples of sedimentary rocks is Sandstone.
The Sedimentary and Igneous rocks, when subjected to great pressure and heat, often turn to metamorphic rock. Limestone changing to marble and clay changing to slate are a few examples.
The entire process through which the rocks go on changing from one form to another form can be known as the rock cycle. We hope that these Inside our Earth Class 7 notes are able to help you out properly in the examination.
FAQ (Frequently Asked Questions)
1. What are the different layers of the Earth’s Interior?
The different layers of the Earth’s interior are known as the Crust, the Mantle, and the Core.
2. What is the radius of the Core of the Earth?
The Core of the Earth has a radius of about 3500 km.
3. What are the different types of rocks found on the earth?
The different types of rocks are Igneous, Metamorphic, and Sedimentary.