You are to examine these two statements carefully and select the answers to these items:
Statement I: Minerals are formed by slow cooling of the magma.
Statement II: Very small crystals are formed when lava cools quickly on the surface.

Both the statements are individually true and Statement II is the correct explanation of Statement I

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Both the statements are individually true but Statement II is not the correct explanation of Statement I

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Statement I is true but Statement II is false

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Statement I is false but Statement II is true

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Solution

The correct option is D Statement I is false but Statement II is true
Lava is on the surface so it cools quickly and forms rocks whch are called mineral rocks. Because the magma cools and solidifies quickly, the crystals that form do not have time to grow very large, and therefore most extrusive rocks are finely grained. The most common type of extrusive rock is basalt.

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You are to examine these two statements carefully and select the answers to these items:Statement I: Minerals are formed by slow cooling of the magma. Statement II: Very small crystals are formed when lava cools quickly on the surface.

You are to examine these two statements carefully and select the answers to these items:
Statement I: Minerals are formed by slow cooling of the magma.
Statement II: Very small crystals are formed when lava cools quickly on the surface.