How Does the Antenna on a Radio Work?
How Does the Antenna on a Radio Work? The wire antenna in a radio picks up radio waves sent out through the air by broadcasting stations. These waves create weak...
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How Salty Is the Ocean?
How Salty Is the Ocean? In general, the salinity (saltiness) of the ocean is 3.5 percent by volume. A gallon of seawater contains about a quarter of a pound of salt....
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What Causes Ocean Tides?
What Causes Ocean Tides? Tides are the rise and fall of the levels of the ocean. They are caused by the gravitational pull of the Sun and Moon as well as the rotation...
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What Causes Waves in the Ocean?
What Causes Waves in the Ocean? Most waves in the ocean are caused by the wind. Somewhere over the ocean, wind ruffles the surface of the water. Ripples form and grow...
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Where Does Sand Come from?
Sand is made from tiny grains of rocks and minerals. Almost every grain of sand was once part of a big rock. Heat and cold caused cracks in the rocks, and wind and...
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