4.4 Changing the Planet

• Biologie
• 7th Grade

Ozone

and skin cancer caused by UV radiation

00:14

What does the layer of Ozone gas do?

1. It helps to get more UV rays to shine on Earth
2. It helps to get less UV rays to shine on Earth

01:09

Ozone stops a lot of UV light from
getting to Earth. Why is this important?

01:23

Ozone is broken down by a chemical called...

1. FCF
2. ABC
3. CFC
4. CBA

01:52

Which is true?

1. UV rays break down CFC's, and this destroys Ozone
2. UV rays break down Ozone, and this destroys CFC's

03:03

Explain in 2 sentences why today we have
less chance of skin cancer
than 20 years ago.

Acid Rain

and damaged plant life

01:39

Summary: How do acid
gasses get into the air?

03:15

Explain: how does acid rain
destroy a food chain?
(hint: think of plants, or trees, or fish)

Carbon dioxide

and global warming

00:34

A glass greenhous (glazen kas) keeps plants warm by...

1. Stopping cold air from coming in
2. Keeping warmth from heaters inside longer
3. Pushing cold air out
4. Keeping the sun's warmth inside longer

01:14

Greenhouse gasses....

1. Keep the cold out of the Earth's atmosphere
2. Keep some of the sun's heat out of the Earth's atmosphere
3. Keep some of the sun's heat inside of the Earth's atmosphere
4. Keep all of the sun's heat inside of the Earth's atmosphere

01:41

Explain: why is it bad to have
too much carbon dioxide
in the atmosphere?