Class-7 Inside Our Earth

 

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#1. The uppermost layer over the earth’s surface is called the ____

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#2. ____ is the Earth’s thinnest of all the layers.

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#3. The thickness of uppermost layer over the earth’s surface is about ___ km on the continental masses.

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#4. The thickness of uppermost layer is ___ km on the ocean floors

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#5. The main mineral constituents of the continental mass are ____

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#6. The oceanic crust mainly consists_____

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#7. To reach to the centre of the earth (which is not possible!) you will have to dig a hole ____ km. deep on the ocean floor.

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#8. The deepest mine in the world is in ____.

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#9. Depth of mantle is up to ____ km below the crust.

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#10. The innermost layer is the earth is called ____

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#11. The radius of core of about ____ km

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#12. The innermost layer of earth is mainly made up of ___

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#13. The central core has _____

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#14. The radius of the earth is _____ km.

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Write the volume of layers in %

#15. The crust ___ per cent of the volume of the earth

#16. Mantle consists of _____ per cent of earth volume.

#17. Core consists of ____ per cent of earth volume

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#18. The remains of the dead plants and animals trapped in the layers of rocks are called _____

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#19. Any natural mass of mineral matter that makes up the earth’s crust is called a ____

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#20. Rock formed when the molten magma cools are called ______ rocks.

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#21. ____ rocks are also called primary rocks.

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#22. Rocks formed by rapidly cooling of molten lava on the earth’s surface are called ______ igneous rocks.

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#23. Solid rocks so formed, when the molten magma cools down deep inside the earth’s crust are called ____ igneous rocks.

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#24. extrusive igneous rocks are _____grained structure

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#25. Intrusive igneous rocks are _____grained structure

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#26. Basalt is example of ____

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#27. Granite is an example ____ rock.

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#28. The Deccan plateau is made up of ____rocks

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#29. Stones used to prepare paste/powder of spices and grains are made of ___rocks.

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#30. Rocks roll down, crack, and hit each other and are broken down into small fragments. These smaller particles are called ____

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#31. Sediments are compressed and hardened to form layers of rocks. These types of rocks are called ____ rocks

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#32. Sandstone is example of ____ rock.

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#33. ____ rocks may also contain fossils of plants, animals and other microorganisms.

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#34. Igneous and sedimentary rocks can change into _____ rocks under great heat and pressure

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#35. clay changes into ___ under great heat and pressure.

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#36. limestone change into _____ under great heat and pressure

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#37. The Red Fort is made of red _____

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#38. The Taj Mahal is made of white ____

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#39. This process of transformation of the rock from one to another is known as the ____

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#40. Igneous rocks are broken down into small particles that are transported and deposited to form ____ rocks

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#41. When the igneous and sedimentary rocks are subjected to heat and pressure they change into ____ rocks.

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#42. The metamorphic rocks which are still under great heat and pressure melt down to form molten ____

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#43. Rocks are made up of different ____

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#44. ____ are naturally occurring substances which have certain physical properties and definite chemical composition.

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#45. Gold, petroleum and coal are examples of ____

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#46. Made of silicon and alumina

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