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प्रश्न
Study the figure on the side and answer the question
What is known as Sial? How deep is the area marked by Sial?
उत्तर
Sial is the upper layer or crust of the earth. The name Sial is based on the excess of Silica and Aluminium. The depth of Sial is 60 km.
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संबंधित प्रश्न
Why is the earth’s interior in most part found in a solid state despite great heat and pressure?
Describe the layers of the interior of the earth and their chemical composition.
Study the figure on the side and answer the question
What happens to the continents if there is an earthquake?
Which are the two most abundant chemical elements in the Earth’s crust?
Give reasons for the following:
Earth movements have modified the Earth’s surface.
______ is the rigid outer layer of the Earth.
Distinguish between Core and Crust.
Match the following:
| (a) | Crust | (i) | 2,171 km |
| (b) | Upper Mantle | (ii) | 2,259 km |
| (c) | Lower Mantle | (iii) | 30 km |
| (d) | Outer Core | (iv) | 1221km |
| (e) | Inner Core | (v) | 720 km |
______ is a vent (or) and opening on the surface of the Earth crust.
Consider the given statement
- When magnia reaches this Earth’s surface, it is referred to as ‘Lava’.
- The interior of the earth contains very hot molten material called ‘Magma’.
- Sedimentary are also called Primary (or) Mother rocks.
