Ques:Q: What are the two types of earth crust? Choices: - reflective and continental - micro and continental - amorphous and continental - oceanic and continental A:

Ans:oceanic and continental
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Ques:Q: What slow process is required for formation of soil? Choices: - leaching - digestion - fossilization - weathering A:

Ans:weathering
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Ques:Q: What are indestructible and constantly in motion? Choices: - viruses - crystals - ions - atoms A:

Ans:atoms
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Ques:Q: What must happen for two ions to form an ionic bond? Choices: - two ions need to have the same charge - Two ions need to be the same size - two ions need to have neutral charges - two ions need to have opposite charges A:

Ans:
two ions need to have opposite charges
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