Pollution means dirty air, water, or land. Pollution can hurt people, animals, and plants.
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Precipitation is water that falls from clouds. Rain, snow, sleet, or hail.
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Temperature tells how hot or cold something is.
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Water is a liquid. People, plants, and animals need water.
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Acid means strong water that can cause damage. Acidic water has a low pH.
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Alkaline means not acidic. Alkaline water has a high pH.
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An aquifer is water underground. People get drinking water from aquifers.
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The atmosphere is the air around Earth.
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Basic means not acidic. Basic water has a high pH.
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Warm water gas cools. It changes into liquid water. Clouds form.
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Water gets warm. Water changes from liquid to gas. Water goes into the air.
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The ground is the land we walk on.
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The hydrologic cycle is how water moves. Water goes up, down, and around Earth again and again.
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Hydropower uses moving water to make electricity.
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The hydrosphere is all the water on Earth. Oceans, rivers, lakes, ice, and groundwater.
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Infiltration is when water goes into the ground.
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Neutral means not acidic and not basic. Neutral water has a pH of 7.
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Permeability means how easily water moves through something.
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Permeable means water can pass through.
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pH level shows how acidic or basic water is.
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Porosity means how many spaces are in soil or rock. More spaces = more water can fit.
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Puddling is water staying on the ground. Water does not soak in.
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Runoff is water moving over land. Water flows to rivers and lakes.
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Salinity is how much salt is in water.
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The surface is the top layer. Water can stay on the surface.
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Ice changes directly into gas. It does not become liquid first.
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A watershed is land where water drains. All water goes to the same river or lake.
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Water quality tells how clean water is. Clean water is safe to use.
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