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:
1. three main layers of the earth are crust, mantle and core
2. any natural mass of mineral matter that makes up the earth crust is called a rock
3.igneous rock - basalt and granite
sedimentary rock - sandstone
metamorphic rock - slate and marble
4. igneous and sedimentary rock can change into metamorphic rock under great heat and pressure
5. a volcano is vent (opening) in the earth crust through which molten Material erupts suddenly
Answer:
a. crust mantle and core
b.A rock is an aggregate of one or more minerals . Rocks may be hard or soft and in varied colour
c. granite sandstone slate
d. these rocks form under the action of pressure volume and temperature changes
e. a volcano is a place where gases ashes and molten rocks material- Lava -escape to be growned