Resources are classified as renewable or nonrenewable according to the

a.
pollution that their use causes

b.
time needed to form them

c.
expense in acquiring them

d.
minerals they contain

The earth's internal process which drives seafloor spreading is

While most people who lived in ancient egypt and the middle east avoided settling in nearby deserts, those regions protected them from their enemies. why do you think this was true?

[ou.01jthe greatest speed with which any physical object moves is 300,000 km/soundsec. which of the following has a speed of 300,000 km/sec? a.light in water b.light in vacuum c.sound in air. d. sound in water