Name the main mineral constituent of the continental mass.
Silica and alumina
GEOGRAPHY
What is the special feature of this layer?
It is the thinnest of all the layers
What is called the uppermost layer of the earth?
It is called the crust.
Limestone is changed into marble.
Limestone is changed into marble due to the following reasons: The overlying layers of rocks put pressure on the underlying rocks. From the surface to the interior of the earth, temperature and heat go on increasing. Due to pressure and heat, the original limestone changes into marble.
Sedimentary rocks are formed from sediments.
Sedimentary rocks are formed from sediments because of the following reasons: Igneous rocks and metamorphic rocks, decompose, disintegrate and wear down due to weathering. This material is carried away by running water (rivers), wind, glacier. The material is then deposited in low lying areas and is called sediments. When sediments are solidified into layers due …
We cannot go to the centre of the earth.
We cannot go to the centre of the earth because of the following reasons: The thickness (from crust to the core) is 6371 km. (Radius of the earth). Temperature increases with depth @ 1°C per 32 metre. There is extreme heat and pressure of overlying rocks, everything is in a molten state. There is no …
What are metamorphic rocks?
Metamorphic Rocks When under heat and pressure igneous rocks and sedimentary rocks change their form and more precious rocks are formed to be known as metamorphic rocks.Examples:★ Granite into granite gneiss.★ Coal into slate.★ Slate into schist.★ Limestone into marble.
What are the uses of rocks?
Uses of Rocks Hard rocks are used in making buildings and barrages. Houses and buildings are built of rocks (stones, slates, granite, marble). Stones are used in numerous games: Seven stones (phitthoo). Hopscotch (stapu, kit). Five stones (gitti). Rocks (stones and slates) are used in building bridges, embankments.
What do you mean by a rock cycle?
Rock CycleIgneous rocks change into sedimentary rocks, igneous and sedimentary rocks under heat and pressure change into metamorphic rocks, metamorphic rocks into igneous rocks or sedimentary rocks due to melting or wearing down. This process is called the rock cycle.
How are extrusive and intrusive rocks formed?
Formation of Extrusive and Intrusive Rocks Due to extreme heat in the interior of the earth, rocks are found in the form of molten material called magma. When magma comes out on the surface of the earth, it cools down and turns into solid rocks. Such rocks are termed as extrusive rocks.Examples:★ Basalt.★ Deccan Trap …