Approximately what percentage of Earth's surface is covered by water? (1) 100% (2) 75% (3) 50% (4) 25%

If 70 percent of the earth's surface is covered with water, why do 500 million people around the world have trouble getting the water they need?

Solve for $a, b$ and $c$.

$$\begin{aligned} a+b+c & = -5\\ a-b+c & = 1\\ 4a - 2b + c & = 7 \end{aligned}$$

What percentage of Earth's surface is covered by glaciers?

a. 5 percent

b. 10 percent

c. 15 percent

d. 20 percent

What percentage of Earth's water is fresh water?

(a) 3 percent

(b) 10 percent

(c) 50 percent

(d) 90 percent

(e) 97 percent.

About 75 percent of Earth's surface is covered with water. Find out how much of this water is ice, how much is fresh water, and how much is part of the biggest solution of all-our ocean water.

Water covers approximately 70% of Earth’s surface. Assume Earth is a sphere with diameter about 13,000 km. What amount of Earth’s surface is covered with water?

Which land biome contains the greatest species diversity? A. tundra, B. grassland, C. desert, D. tropical rain forest.

Build this expression with algebra tiles. Use legal moves to determine which expression is greater, if possible. If it is not possible to determine which expression is greater , explain why it is impossible. Be sure to record your work on your paper. Which is greater: x+1-(1-2x) or 3+x-1-(x-4)?

How much of the Earth's surface is covered by water?

About how much of the Earth is water?

Which type of coastline would most likely contain estuaries or fjords?

Which is Earth's thinnest layer? (a) crust (b) inner core (c) mantle (d) outer core

Where is most of Earth's water located?