Question

the four spheres of earth are all connected; have nothing to do with one another; also exist on venus and mars; do not affect human life. one of the reasons why the population growth rate has decreased is birth control is available and people can choose if/how many children to have. true; false. materials or substances such as minerals, forests, water, and fertile land that occur in nature and can be used for economic gain. natural resources; synthetic resources; global commons; local commons

Explanation:

1. The four spheres of Earth (atmosphere, hydrosphere, biosphere, geosphere) are interconnected and interact with each other.
2. Birth - control availability allows people to make choices about family - size, which is a factor in the decrease of population growth rate.
3. Minerals, forests, water, and fertile land that occur in nature and can be used for economic gain are natural resources.

Answer:

1. are all connected
2. True
3. Natural Resources