Question

The Earth's crust is made up of the solid material called rocks that constitute 1% of it's weight. Rocks vary in colour, texture, chemical composition and softness. While granite and marble are hard; sand ,limestone and clay are soft. Rocks may or may not be crystalline in their structure .The main constituents of rocks are minerals.
Define - Rocks
Give one Example for each rock - 1) Hard Rock 2) Soft Rock
What is main constituents of rocks
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Answer 1

Lutgens and Edward J. Tarbuck, Earth's crust is made up of several elements: oxygen, 46.6 percent by weight; silicon, 27.7 percent; aluminum, 8.1 percent; iron, 5 percent; calcium, 3.6 percent; sodium, 2.8 percent, potassium, 2.6 percent, and magnesium, 2.1 percent

Answer 2

Answer:

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