vocabulary about earth water supply

desalination getting fresh water from seawater.

water cycle the continuous movement ofwater between earth surface and the air,changing from liguid to gas to liguid.

groundwater water that seeps into the ground into spaces between bits of rock and soil.

water table the top of the water filled spaces in the ground.

aquifer an underground layer of rock or soil  filled with water.

spring a place where ground water seeps out of the ground.

well a hole dug below the water table that water seeps into.

reservoir a storage area for freshwater supplies.
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vocabulary about earth atmosphere

renewable resource a resource that can be replaced in a short period of time.

ozone layer a layer of ozone gas in the atmosphere that screens out much of the sun,s UVrays.

fossil fuel a fuel formed from the decay of ancient forms of life.

smog a mixture of smoke and fog.

acid rain moisture that falls to earth after being mixed with wastes from burned fossil fuels.
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vocabulary about earth rock and soil

rock a naturally formed solid in the crust,made up of one or more minerals.

igneous rock a rock formed when melted rock materia cools and hardens.

sedimentary rock a rock made of bits of matter joined together.

fossil any remains or imprint of living things of the past.

metamorphic rock a rock formed under heat and pressure from another kind of rock.

humus decayed plant or animal material in soil.

pollution adding any harmful substance to earth,s land,water or air.

rock cycle rocks changing from one form into anothr in a never-ending series of processes.
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