Which of the following is not a challenge of life on land?

a. toxic effects of oxygen

c. energy demands of walking

b. variable air temperature

d. moisture loss

Which republic that ruled Italy had citizens elect representatives to rule in their name?

What is one type of physical feature that can be used to describe locations on earth?

The time that it takes for the earth to rotate 45° is

How have the economies of Canada and the United States changed as technology has developed?

What 3 forces slowly turn the remains of plants and animals into oil?

On a planimetric map, the ___ is used to convert between the distance on the map and the actual distance in real life.

Will climate change will result more or fewer landslides or there be about the same number as now?

When lava cools, it forms a hard rock. True or false?

The total process that turns sediment into rock is called perrifaction, lithification, or metamorphesis?

Renewable resources: A. have finite supplies that will one day be used up. B. include iron, gas, and copper. C. are all living resources. D. can be replenished over months, years, or decades.