Water

Sci 5.2 + 5.3

H2O necessary to all life• ~70% of your body

Question 1

1a. Can life as we know it exist without water? Yes/No1b. About what percentage of your body is water? 90%, 70%, 50%, 25%

Capillary action• Result of H2O molecule adhesion + cohesion

• Helps pull H2O up plant stems

Question 2

2a. The skinnier a tube is, the higher water will climb thanks to what? Capillary action, antigravitation, water transition, microbuoancy2b. Capillary action will move water up until the cohesive and adhesive forces equal what force? The force of acceleration, the force of evaporation, the force of gravity on the water column

H2O uses

Residential& business

Manufacturing

Question 3

3a. Where do people use the most water? Hydroelectric power, farming, homes, factories 3b. Of all the water people use, what percentage is used in generating electricity? 41%, 38%, 11%, 10%

Irrigation flood

dripspray

Question 4

4a. What’s the least efficient type of irrigation? Flood, spray, drip4b. What’s the most efficient form of irrigation? Flood, spray, drip

H2O conservation: using it carefully

Question 5

5a. Do people typically use more water inside or outside the home? Inside, outside, same for both5b. Inside the home, people generally use the most water doing what? Washing clothes, taking showers, dong dishes, flushing toilets

Distribution• ~70% of earth’s surface covered with H2O

• ~97% salt H2O

• ~2% glaciers/ice caps

+ rivers

(Mainly ice caps)

Distribution

Question 6

6a. About what percentage of the earth is covered with water? 90%, 70%, 50%, 30%6b. How much of the water on the earth is salt water? 97%, 70%, 50%, 2%

Ground H2O• Underground in aquifers (rock and sediment)

Question 7

7a. Most of the world’s usable liquid fresh water is found where? lakes and rivers, oceans, underground, ice caps7b. An area made of porous rock and or sediments that holds high quantities of fresh water is called a what? Aquifer, mine, quicksand, mud

Surface H2O• Rivers, lakes, etc. = 0.01% of all water

Question 8

8a. Most of the world’s fresh water is found in lakes, ponds, rivers, streams. T/F

8b. About how much of the world’s water is found in lakes and rivers? 1%, 1/10%, 1/100%, 1/1000%

Atmospheric H2O• Heat released from condensation drives storms

Question 9

9a. When water vapor condenses into liquid droplets in rising warm air heat is: released increasing air flow, heat is absorbed decreasing air flow9b. Clouds form when water vapor condenses in: rising air, falling air

The H2O Cycle: H2O is recycled

transpiration: plants losing water to air precipitation: water falling out of sky

Question 10

10a. Most of the rain and snow that hits the ground is not chemically combined with anything else. T/F10b. About how long does it take for a water molecule to go through the water cycle? Up to: 10days, 1month, several years, millions of years