A. Answer the following questions orally.
1. Name the three main layers of the earth.
2. What are rocks?
3. Give one example each of igneous, sedimentary and metamorphic rocks.
4. How are metamorphic rocks formed?
5. What is a volcano?
Answers
Answer:
A. Answer the following questions orally.
1. Name the three main layers of the earth.
ANS: Crust, Mantle and Core
2. What are rocks?
ANS: A rock is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition and the way in which it is formed. Rocks are usually grouped into three main groups: igneous rocks, metamorphic rocks and sedimentary rocks.
3. Give one example each of igneous, sedimentary and metamorphic rocks.
ANS: Examples of igneous rocks include obsidian (volcanic glass), pumice, and basalt. Examples of sedimentary rocks include sandstone, limestone, shale, and silt stone. Examples of metamorphic rocks include marble, garnet, and slate.
4. How are metamorphic rocks formed?
ANS: Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic form. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors.
5. What is a volcano?
ANS: a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are or have been erupted from the earth's crust.
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Answer:
A. 1.the crust, the mantle and the core.
2.rocks are a mineral matter that makes up the earth's crust. They can be in different colour, size and texture
3.eg of igneous -, pumice, basalt.
eg of sedimentery- sandstone, limestone
eg of metamorphic- marble and slate.
4.Metamorphic rocks form when rocks are subjected to high heat, high pressure.
5. A volcano is a opening on the earth's crust .
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