Approximately what percentage of earth's water is fresh water?

a. 97 percent

b. 71 percent

c. 30 percent

d. 3 percent

A wave's frequency is 2 Hz and its wavelength is 4 m. What is the wave's speed?

What president signed the national environmental protection act

Area A is located close to a volcanic vent, but area B is far away. What is the expected distribution of iron ore deposits in each area?

Which of the following earthquake waves cause the material they pass through to compress and extend? Select one: a. P-waves b. S-waves c. Surface waves d. All of the above

Kepler discovered the forces that govern planetary motion. a. True b. False

The main plant adaptations in the tropical rainforest environment

1. What's the definition for ecological perspective 2. What the definition for spatial perspective

Which of the following terms describes a family structure headed by a woman?

Which of these is a renewable resource? a. coal b. cotton c. copper d. petroleum

What are the classifications for the six major land areas on earth?