Continents, islands, mountains, and the ocean floor form part of the a. biosphere c. hydrosphere b. atmosphere d. geosphere

The point where two air masses meet is called a

Which of the following is not a place where hydrogen can be found on earth? a. natural gas well b. atmosphere c. water d. mine

Which feature of a map shows the relationship between a distance on a map and that distance on earth? key scale grid system compass rose