SCIENCE UNIT 5 EXAM REVIEW (WHOLE CHAPTER)

Question 1

Why can’t life exist without water?

Answer 1

Our producers need water to photosynthesis - carbon cycle
Water meets basic human needs

Question 2

What percent of our Earth’s water is salt water? Give some examples

Answer 2

90% of Earth’s water is salt water
ex/ oceans, seas, some lakes

Question 3

What percent of Earth’s water is fresh water? Give some examples

Answer 3

Less than 3% is fresh water
ex/ wells, lakes, rivers, ponds

Question 4

Approximately _____ to _____ percent of your body is water. Can this change? Why?

Answer 4

1. 60-70% of our body is water
2. It can change by
   DEHYDRATION
   SICK
   HOT
   DIET
   GROWING

Question 5

List and explain the process of the water cycle.

Answer 5

Evaporation - liquid to gas. Liquid water evaporates and forms water vapour
Condensation - Gas to liquid. When air becomes so cool it cannot hold any more water vapour and liquid water gets released.
Precipitation - Process in which liquid water forms from condensation occurring inside clouds. Then releasing hail, sleet, snow, rain, etc..
Ground water - Water in the soil. Plant roots can grow down to reach ground water.
Run off - water that runs off the ground into lakes, rivers, or streams
Transpiration - Water is taken in through a plants roots evaporates from the plants leaves, stem, and flowers

Question 6

Indicate the distribution of water.

Answer 6

Ground water - 0.63%
Rivers, lakes, ponds, streams - 0.02%
Glaciers, ice bergs, sheets - 2.15%
Oceans and seas - 97%