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34 Cards in this Set

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What is the water cycle?



(water cycle)
The movement of water among the oceans, atmosphere, land and living things
What is precipitation?



(precipitation)
Movement of water from the atmosphere to the oceans and land
Name different kinds of precipitation



(precipitation)
Rain, snow, sleet and hail
How much of the precipitation falls into the ocean?



(precipitation)
about 90%
When precipitation falls on the land,what does it do?



(precipitation)
It renews the water.
How does water cycle back to the atmosphere?




(evaporation)
Through evaporation
During evaporation,what causes the water to change from liquid to vapor?



(evaporation)
The sun's heat
What happens during condensation?



(evaporation)
the water vapor cools and it forms a liquid that falls to the Earth as precipitation
What is ground water?



(ground water)
precipitation that seeps into the ground
How is ground water stored?



(ground water)
it is stored in underground caverns or in porous rock
How long can ground water stay in the ground?



(ground water)
for a very long time
What does ground water do?



(ground water)
provides water to the soil, streams, oceans and rivers
What do all organisms contain?



(water and life)
a lot of water
What per cent of your body is made up of water?


(water and life)
70%
What 2 things does water do for your body?



(water and life)
1. takes waste products out of your body
2. regulate your temperature
What happens if there is no water?



(water and life)
there is no life
What is transpiration?


(water and life)
when the body returns water back to the environment through perspiration and evaporation
Who needs carbon?




(carbon cycle)
every living thing
What is the carbon cycle?




(carbon cycle)
movement of carbon from living things to the environment and from the enviroment to living things
What is photosynthesis?




(photosynthesis)
how carbon moves from the environment into living things
Who respires?



(respiration)
animals and plants
What happens during respiration?




(respiration)
sugar molecules are broken down to release energy
During respiration, what are two of the byproducts?




(respiration)
carbon dioxide and water
What is decomposition?




(decomposition)
breakdown of dead animals into carbon dioxide and water
How is carbon returned to the environment?




(decomposition)
when fungi and bacteria decompose organic matter, they return carbon to the environment
What is combustion?




(combustion)
process of burning fuel
How does combustion affect the atmosphere?




(combustion)
the carbon in coal, oil and natural gas returns to the atmosphere as carbon dioxide
What is the nitrogen cycle?




(nitrogen cycle)
movement of nitrogen from the environment to living things and from living things back to the environment
How does nitrogen enter the human body or get returned to the environment?




(nitrogen cycle)
bacteria is needed
How much of the Earth's atmosphere is nitrogen?




(nitrogen cycle)
about 3/4
Can humans use nitrogen gas?




(nitrogen cycle)
no
What breaks down the nitrogen into forms that plants can use?




(nitrogen cycle)
bacteria
How do humans get their nitrogen?




(nitrogen cycle)
by eating the plants
How is nitrogen gas returned to the atmosphere?




(nitrogen cycle)
other bacteria break down dead organisms and animal wastes which produces nitrogen gas