IB ESS 7.2

Which options are true for Stratospheric ozone? (select all that apply)

• CFCs are stable in the troposphere

• CFCs are unstable in the stratosphere

• Tropospheric O3 is a pollutant and Stratospheric O3 is a protectant

• O3 naturally absorbs UV and breaks apart

Tags

NGSS.HS-PS4-3

Which are consequences of stratospheric ozone depletion? (select all that apply)

• cataracts

• skin cancer

• phytoplankton population increase

• decreased crop yield

• wrinkling/aging/burning of skin

Tags

NGSS.HS-LS4-5

Which chemical that replaced CFCs in refrigerants is now a concern as a major greenhouse gas?

• CFCs

• HFCs

• DDT

• CFCl2

Tags

NGSS.HS-ESS3-5

NGSS.HS-ESS3-6

Which is most strongly absorbed by ozone in the statosphere?

• UV-A

• UV-B

• UV-C

• UV-B and UV-C

• UV-A and UV-B

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

Why are the ozone holes (arctic and antarctic) over the poles? ...chose the ONE best answer...

• stratospheric ice clouds

• global winds

• global distillation effect

• ODS use is greatest at the poles

Polar Ice Caps are melting due to an increase in Earth's temperature. This lowers the albedo of Earth, which in turn increases Earth's temperature. This is an example of what type of feedback?

• Negative

• Neutral

• Positive

• Ecosystem

Tags

NGSS.HS-ESS2-2

NGSS.HS-ESS3-5

A ________________ feedback loop makes a system more stable.

• Positive

• Neutral

• Negative

• Circular

Tags

NGSS.HS-LS1-3

Which type of feedback is shown in the figure below?

• positive feedback loop

• negative feed back loop

• neutral feed back loop

• tipping point

Answer explanation

This feedback will amplify the change in the system. Once the vegetation cover is removed it will cause more vegetation cover to be removed. So accelerating the change in the system.

Tags

NGSS.HS-ESS2-2

NGSS.HS-ESS3-5

A tipping point is part of a system that kick starts self-perpetuating positive feedback loops that push the systems to a new state of equilibrium. If tipping points are reached in the natural environment, which one of the following could happen?

• Land and seas’ food production capacity could be compromised.

• The climate may become unsuitable for human existence.

• Environmental support services could collapse.

• All of these are possible outcomes of tipping points in the natural environment.

Answer explanation

Are any of these outcomes more significant than the others? or are they all equally significant? Are all of these examples a possible result of reaching a tipping point or just one?

Tags

NGSS.HS-ESS2-2

NGSS.HS-ESS2-4

NGSS.HS-ESS3-1

NGSS.HS-ESS3-5

Which of the following explains why stability varies between ecosystems?

• Climate, limiting factors.

• Biodiversity, trophic complexity.

• Frequency and intensity of disturbances.

• All the responses are correct.

Tags

NGSS.HS-LS2-6