Humus is broken down........ and ........ material.

A................ is an ecosystem that has a dry climate.

A ........................ forest is an ecosystem that is warm and rainy all year long.

The soil in a ................. forest is not very rich in nutrients .

............ forests have different weather during different seasons.

The soil in temperate forest is rich in ...............

The largest environment on Earth is a body of water called a/an ............

Earth has five oceans

The largest ocean is the .................. Ocean

•Wetlands are often found along the edges of .......... ,........... ,............ ,and ..............

Wetlands help prevent land from flooding by collecting water.