Question

1. what percent of earths total water supply is fresh (non - salt) water?

a. more than 90% d. 3%
b. 50% e. less than 1%
c. 25%

1. where is the majority of the fresh water on earth?

a. frozen as ice caps or glaciers (about 75%) c. in lakes and ponds
b. underground (about 20%) d. in the atmosphere

1. which statement about plastic water bottles is accurate?

a. they are completely safe to reuse indefinitely
b. they break down slowly over time and can leach chemicals
c. they are designed for unlimited reuse
d. they become stronger with repeated use

1. what was the primary environmental concern with aerosol cans in the 1980s?

a. they contribute to water pollution c. they increase ground - level pollution only
b. they release compounds that deplete the ozone layer d. they have no environmental impact

1. regarding nuclear power plants, which statement is correct?

a. they release significant air pollution c. they produce no emissions whatsoever
b. they release only water vapor into the atmosphere d. they primarily release carbon dioxide

1. how do urban temperatures typically compare to natural ecosystems?

a. the temperatures are significantly lower c. they temperatures are significantly higher
b. the temperatures are exactly the same d. the temperatures fluctuate randomly

Explanation:

1. Approximately 3% of Earth's total water supply is fresh (non - salt) water.
2. The majority of fresh water on Earth is frozen as ice caps or glaciers (about 75%).
3. Plastic water bottles break down slowly over time and can leach chemicals.
4. The primary environmental concern with aerosol cans in the 1980s was that they release compounds that deplete the ozone layer.
5. Nuclear power plants release only water vapor into the atmosphere.
6. Urban temperatures are significantly higher than in natural ecosystems.

Answer:

1. d. 3%
2. a. Frozen as ice caps or glaciers (about 75%)
3. B. They break down slowly over time and can leach chemicals
4. B. They release compounds that deplete the ozone layer
5. B. They release only water vapor into the atmosphere
6. C. They temperatures are significantly higher