Question

1. select the best answer. population ____ is calculated by dividing the number of people in an area by the square kilometers of the total land area.
2. select the best answer. clouds are part of the ____

Explanation:

Population density is defined as the number of people per unit of land area (square - kilometers in this case). Clouds are made of water vapor and liquid water droplets, and they are part of the hydrosphere which encompasses all water on Earth including in the atmosphere.

Answer:

1. density
2. hydrosphere