E. Short Answer Type Questions :
1. Differentiate between the intrusive and extrusive igneous rocks.
2. Name the three types of rocks and give one example for each.
3. How are minerals useful to us?
Answers
Answer:
1. Intrusive Igneous Rocks Extrusive Igneous Rocks
Since these rocks cools down slowly, they have coarse texture with large crystals Since these rocks solidify at a faster pace, they are smooth, crystalline and fine grained.
2. There are three kinds of rock: igneous, sedimentary, and metamorphic. Igneous rocks form when molten rock (magma or lava) cools and solidifies. Sedimentary rocks originate when particles settle out of water or air, or by precipitation of minerals from water.
3. minerals are all around us! They help us to develop new technologies and are used in our everyday lives. Our use of rocks and minerals includes as building material, cosmetics, cars, roads, and appliances. In order maintain a healthy lifestyle and strengthen the body, humans need to consume minerals daily.