Earth

Which of the following minerals is the hardest?

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Which of these is a soil that is better to grow plants in?
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What is the largest natural carbon sink on earth?
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What is an uplifted area with a flat top called?
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What is the hardest mineral known on Earth called?
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Which type of irrigation is most commonly used throughout the world?
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What type of fossils give only evidence of activities of past living creatures?
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What soft brown coal that has lost all of its moisture called?
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What destructive event can happen when it rains for a long period of time?
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