The hottest natural temperature ever recorded on earth is ___________

The coldest natural temperature ever recorded on earth is ____________.

What is the rarest natural element in the earth?

The oldest recorded alga is …………

For energy, the earth is:

If there is no greenhouse effect, then the average temperature at surface of earth would have been

If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now ?

Name three types of natural sources of fresh water on Earth.

Complete the analogy : Shape of the Earth at equator: Bulged :: shape of the Earth at poles:________________

In january the high temperature was recorded 90°F and the low temperature was -2°F. Find the difference between high and low temperature.