Which statements about freshwater sources are true? check all that apply. only about 3 percent of earth’s water is fresh water. most of the fresh water on earth is groundwater. about 75 percent of the fresh water on earth is frozen in ice sheets. the largest source of usable fresh water is groundwater. more fresh water is in the atmosphere than in rivers and lakes.

Options (1) and (3)

Explanation:

Water is the most vital element on earth and all living organisms are dependent on it. It supports life and is found in the different parts of the earth and in different forms. The majority of the earth is comprised of water and out of all the total water present on earth, about 97% of it is saline water and the remaining 3% is the only freshwater.

From this total freshwater composition, approximately 75% of it is the water present in the form of glaciers and ice in the polar region, other 24% is the groundwater, and the remaining 1% includes all the surface water present on earth that includes the waters of rivers, lakes, and ponds.

The main source of usable freshwater is the waters trapped in the glaciers and ice. Some of the water is also present in the atmosphere in the form of vapor but they are significantly less in amount.

Thus, the correct answers are options (1) and (3).

Freshwater is a scarce resource because about 75 percent of the fresh water on Earth is frozen in ice sheets.

The surface of earth is mostly covered with water. However, aquatic ecosystems are divided into;

Water is also contained in underground aquifers as groundwater.

Marine waters cover most of the surface of the earth. Freshwater is a scarce resource because about 75 percent of the fresh water on Earth is frozen in ice sheets. Only about 3 percent of Earth’s surface water is fresh water.

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explanation:

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles