Question

1 what might happen if earth did not have an atmosphere?
a everything on earths surface would fly off into space
b earth would be hit with more meteors and radiation
c earths rotation would stop
d the seasons would be longer

2 why is the ozone layer important?
a it traps most of the suns heat
b it contains most of earths oxygen
c it blocks harmful uv rays
d it allows uv rays to warm the stratosphere

3 which region of the atmosphere is filled with charged particles?
a troposphere
b mesosphere
c ionosphere
d exosphere

4 which statement about earths atmosphere is true? choose two.

• oxygen is the most abundant gas in earths atmosphere
• gases in the stratosphere protect living organisms from uv radiation
• wavelength affects the color of light and how atmospheric gases interact with the light
• earths atmosphere absorbs visible light most efficiently

Explanation:

Question 1

• Option A: Earth's gravity keeps things on the surface, not the atmosphere, so A is wrong.
• Option B: The atmosphere burns up meteors and blocks radiation. Without it, more meteors and radiation would hit Earth, so B is correct.
• Option C: The atmosphere doesn't affect Earth's rotation, so C is wrong.
• Option D: Seasons are due to Earth's tilt, not the atmosphere, so D is wrong.

• Option A: The greenhouse effect (trapping heat) is mainly by gases like CO₂, not ozone, so A is wrong.
• Option B: Most oxygen is in the troposphere, not ozone layer, so B is wrong.
• Option C: Ozone layer (in stratosphere) blocks harmful UV rays, protecting life, so C is correct.
• Option D: Ozone layer blocks UV, not allow it to warm stratosphere (though stratosphere warms due to ozone absorbing UV, but the main importance is blocking UV for life), so D is not the main reason for importance.

• Option A: Troposphere has weather, no charged particles, so A is wrong.
• Option B: Mesosphere is for meteor burning, no charged particles, so B is wrong.
• Option C: Ionosphere is part of thermosphere, filled with charged particles (ions), so C is correct.
• Option D: Exosphere is outer layer, no charged particles, so D is wrong.

Answer:

B. Earth would be hit with more meteors and radiation

Question 2