Rocks and Rock Cycle
ICSE · Class 9 · Geography
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See them allWhat is a rock?
Answer
A rock is an aggregate of minerals that forms a more or less definite unit of the Earth's crust. Rocks may contain one mineral or many minerals together.
How are rocks different from minerals?
Answer
Rocks are heterogeneous and do not have a definite chemical composition. Minerals are homogeneous, have a definite chemical composition, and generally have a crystalline form. Silicates and quartz are…
What does the word lithosphere mean in geography?
Answer
The lithosphere is the outer crust of the Earth on which the continents and ocean basins rest. The word 'litho' in Greek means rock or stone.
What are the main types of rocks?
Answer
The three main types of rocks are igneous rocks, sedimentary rocks, and metamorphic rocks. These differ in origin, structure, and formation process.
Why are igneous rocks called primary rocks?
Answer
Igneous rocks are called primary rocks because they are the parent material of all rocks in the rock cycle. They form by the solidification of magma.
What is magma?
Answer
Magma is molten rock material consisting of liquid, gas, and crystals. It is the source material for igneous rocks.
Name the two types of magma and describe them.
Answer
The two types of magma are Basalt Magma and Silicate Magma. Basalt Magma is very hot and highly fluid. Silicate Magma is about 850°C and highly viscous.
How do intrusive igneous rocks form?
Answer
Intrusive igneous rocks form when magma solidifies below the Earth's surface, surrounded by pre-existing rock. Slow cooling at depth usually produces coarse-grained rocks.
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