Question

D. Answer the following questions in brief.
1. What is the special feature of sedimentary rocks?
2. How are metamorphic rocks formed?
3. What is lava?
4. Why are igneous rocks called the primary rocks?
5. What are sediments?​

Answer 1

Answer:

1. Many sandstones show ripple marks on the surface of a bedding plane. The single most characteristic feature of sedimentary rocks is stratification, the arrangement of visible layers. STRATIFICATION A change in the type of sediment being laid down in one place results in the formation of a new rock layer.
2. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids, or, more commonly, some combination of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet.
3. Lava is molten rock that has been expelled from the interior of some planets and some of their moons and even volcanos
4. Igneous rocks are often called primary rocks because they are at the start of the rock cycle.
5. Sediments are usually formed from matter which falls to the bottom of oceans and lakes. The matter includes tiny pieces of other rocks, and dead animals, plants and microorganisms. Also, inorganic chemicals may be precipitated from solution in the water.

Explanation:

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