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