Question

part 3: multiple choice
type the letter of the correct answer.

1. what percentage of earths water is found in the oceans?

a. 50%
b. 70%
c. 90%
d. 97%

1. about how long does it take to go from low tide to high tide?

a. 3 hours
b. 6 hours
c. 12 hours
d. 24 hours

1. what causes most ocean waves?

a. earths rotation
b. the moon
c. wind
d. earthquakes

Explanation:

1. Over 97% of Earth's total water is contained in oceans, with small fractions in freshwater sources.
2. A full tidal cycle (low to high to low) takes ~12 hours, so low to high is half that.
3. Wind is the primary driver of most surface ocean waves; other options cause different water movements like tides or tsunamis.

Answer:

1. D. 97%
2. B. 6 hours
3. C. Wind