Hello I am a sixth grade science teacher:

Question

Which statement is correct?

There is a thick layer of topsoil in tropical rain forests.
There is a thick layer of topsoil in tropical rain forests.

There is a thin layer of topsoil in tropical rain forests.
There is a thin layer of topsoil in tropical rain forests.

There is a thick layer of humus in cold deserts.
There is a thick layer of humus in cold deserts.

There is a thick layer of humus in dry deserts.

Answer 1

The first statement is correct: "There is a thick layer of topsoil in tropical rain forests."

The third statement is also correct: "There is a thick layer of humus in cold deserts."

Answer 2

No answer is:
There is a thin layer of topsoil in tropical rain forests.

Answer 3

I apologize for the mistake. You are correct. The correct statement should be: "There is a thin layer of topsoil in tropical rain forests."