Grade 4 Earth Science - Physical and Chemical Weathering

Question 1

agent = acid rain (rain water mixed with carbon dioxide)

Answer 1

chemical weathering

Question 2

agent = freezing water/ice
ice wedging

Answer 2

physical weathering

Question 3

agent = vegetation (plants - roots, trunks)
root wedging

Answer 3

physical weathering

Question 4

agent = oxidation (oxygen + mineral iron = rust)

Answer 4

chemical weathering

Question 5

agent = wind

Answer 5

physical weathering

Question 6

agent = moving water

Answer 6

physical weathering

Question 7

agent = temperature changes

Answer 7

physical weathering

Question 8

agent = animals and humans

Answer 8

physical weathering

Question 9

mechanical breaking down of rocks - only changes the size and shape of the rock

Answer 9

physical weathering

Question 10

chemical breaking down of rocks - size and shape of rock is changed, but the material that makes up the rock is also changed

Answer 10

chemical weathering

Question 11

shaking a container of sugar cubes

Answer 11

physical weathering

Question 12

combining vinegar and chalk

Answer 12

chemical weathering

Question 13

agent = water

Answer 13

physical weathering

Question 14

agent = living things (plants, animals, and humans)

Answer 14

chemical weathering

Question 15

the breaking down of rocks and minerals on the Earth’s surface into smaller pieces called sediment

Answer 15

weathering

Question 16

term given to the smaller pieces of rock that result from weathering (when a larger breaks into smaller pieces)

Answer 16

sediment