Prentice Hall Science Explorer Earth's Waters Chapter 1, Section 2

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Chapter 1, Section 2

Photosynthesis

process by which plants use water, along with carbon dioxide and energy from the sun, to make their own food

habitat

place where living things live and obtain things it needs to survive
Ex: bodies of water

Distribution of Earth's Water

Most of Earth's water 97% is salt water found in oceans. Only 3% is fresh water. Of that 3%, 3/4 is frozen , almost a quarter is underground and a tiny fraction of Earths's fresh water occurs in lakes and rivers and an even tinier fraction is found in the atmosphere

groundwater

water that fills the cracks and spaces in the underground soil and rock layers
Far more fresh water is located underground than in all of Earth's rivers and lakes

How is Earth's water recycled

naturally, through the water cycle

The cycle has no beginning or end but is driven by the energy of the sun.

What are the 3 steps of the Water Cycle

evaporation
condensation
precipitation

Water Evaporation

molecules at the surface of bodies of liquid absorb energy and change to a gaseous state. Water is always evaporating from oceans, lakes, the soil, puddles, and even plants.

Transpiration

process of evaporation where water is given off through the leaves of plants as water vapor

Why is water important

Water is a large part of every living thing.
Water makes up nearly 2/3's of your body's mass
Water is necessary to keep your body functioning
many living things use water for shelter

How does Earth's water move through the water cycle?

Water is constantly evaporating from the surfaces of oceans and large lakes, puddles....warm air carries the evaporated water molecules upward. The water vapor cools and condenses into liquid water and form clouds. As more water vapor condenses, the water droplets grow larger and larger eventually falling back to Earth in the form of rain , snow, hail, or sleet. This is called prcipitation.

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