What forms the biosphere , where life exits on earth

The ozone hole is at its biggest each year in the ? hemisphere in the ? season.

Political boundaries are determined by the political party in control at the time. true or false

All of the following are reasons why deserts extremely susceptible to wind erosion except a. they lack major root systems b. they contain thin, dry soil c. they have very few plants and trees d. they are extremely hot and lack water