Unit 5 Lesson 4

A soil conservationist works to prevent soil erosion

• True
• False

Acid rain cab be caused by burning fuels that mix with water in the clouds.

• True
• False

Mining removes parts of the Earth, which can permanently change Earth's appearance and physical makeup.

• True
• False

Chemical weathering does not change the minerals in rocks.

• True
• False

Polluted water can harm living things.

• True
• False

Which type of pollution can make it difficult for people to breathe?

• smog

• the greenhouse effect

• acid rain

• the ozone layer

Removing trees can ________ the process of soil erosion.

• slow down

• speed up

• prevent

• not change

When humans cause an oil spill in the ocean __________.

• the oil spreads across the surface of the ocean.

• it is very easy to clean all of the oil.

• no ocean is harmed

• it has no effect on the environment

Which will most likely happen if lake water becomes polluted by humans?

• animals in the lake will die

• there will be more fish in the lake

• The pollution will not hurt the plants or animals in the water.

• It will change the soil around the lake into pebbles.

Without vegetation, soil can be blown or washed away. This is because ________.

• plants create carbon dioxide

• plants' roots hold soil together

• plants have flowers, whose pollen is sticky

• the roots of plants grow straight down