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Podar International School
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## Rocks - Rocks give us fossil fuels like coal and petroleum. - Rocks like limestone are used in the cement industry. - Rocks such as marble and granite are used for construction purposes. ## The Aravallis The Aravallis are in danger due to the presence of a stone quarry. In the past, the area...
## Rocks - Rocks give us fossil fuels like coal and petroleum. - Rocks like limestone are used in the cement industry. - Rocks such as marble and granite are used for construction purposes. ## The Aravallis The Aravallis are in danger due to the presence of a stone quarry. In the past, the area was covered in dense forests, but they have been cleared out, and the mountain itself is at risk of disappearing. **Conduct research on this matter and provide at least three suggestions for preserving the Aravallis.** ## Concept Map ### Structure of the Earth - **Crust:** - Continental crust (SIAL) - Oceanic crust (SIMA) - **Mantle:** - Upper mantle - Lower mantle - **Core:** - Outer core - Inner core ### Rocks And Minerals - Rocks are solid masses of minerals ### The Interior of the Earth - **Rock Cycle:** - **Types of Rocks:** - **Igneous** - Intrusive igneous - Extrusive igneous - **Sedimentary:** - Mechanically formed - Chemically formed - Organically formed - **Metamorphic** ## Let us Exercise 1. **Tick the correct option:** - **What is the thinnest layer of the Earth?** - Crust - **Which type of rock is formed by the solidifying of magma on/near the Earth's surface?** - Igneous - **Granite is an example of which type of rock?** - Intrusive igneous - **Limestone falls under what type of sedimentary rock?** - Chemically formed - **Which of the following is not a metamorphic rock?** - Graphite 2. **Answer the following Assertion & Reason Questions:** - **Assertion (A):** The outer crust of the Earth is thin, while the core are hotter and semi-liquid in some parts. - **Reason (R):** As the Earth rotates, it cools towards the inner core. - **Both A and R are true, and R is the correct explanation of A**. - **Assertion (A):** Rocks come in various colors and textures. - **Reason (R):** Rocks have different types and chemical compositions. - **Both A and R are true, and R is the correct explanation of A**. - **Assertion (A):** Rocks can be made of only one mineral. - **Reason (R):** Not all minerals are rocks. - **Both A and R are true, and R is the correct explanation of A**.