Earth

Which of the following minerals is the hardest?

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What type of topography describes caves, caverns, and sinkholes?
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Which of these habitats is a dry one usually with sand and can sometimes be very hot?
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What process carries minerals down into lower soil horizons?
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What is the hardest mineral known on Earth called?
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What is the solid form of water?
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The side of a sail furthest away from the wind is what?
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Ruby and sapphire are gem forms of which mineral?
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What weather-related season is between June 1 and November 30 in North America?
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