What Are Geodes and How Do They Form?
What Are Geodes and How Do They Form? Geodes are spherical rocks that contain hollow cavities lined with crystals. The name geode comes from the Greek word Geoides,...
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Why Is the Ocean Salty?
Why Is the Ocean Salty? The salt in the ocean comes from the earth’s crust. Since the very beginning of the earth’s history, water on its surface has been...
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What Is Hard Water?
“Hard” water is water that contains large amounts of dissolved minerals in contrast with “soft water”. The presence of these minerals in the water makes it difficult to...
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What Makes Plant Leaves Green?
What Makes Plant Leaves Green? The green we see in leaves comes from a green substance called “chlorophyll,” which the plant uses in making food. Chlorophyll is found...
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What Is a Venus’ Flytrap?
A Venus’ flytrap is a small, insect-eating plant. The leaves of this plant can fold along the center and close up like a trap. On each leaf are tiny trigger...
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