Wonders of the Sea Primary 4

It is the introduction of harmful materials into the environment. It starts with letter P.

Synonym of become extinct, vanish or come to an end.

It refers to all the materials available in our environment which help us to satisfy our needs and wants.

It is an animal, as distinct from a human being. It starts with letter C.

It is the level of material. It has outer, inner and deeper. It starts with letter L.

It is an area, especially one that is different from the areas around it because it has different characteristics or is used for different purposes: It starts with letter Z.

The light coming from the sun.

What is the middle layer of the water?

Synonym of strange, not known, or not understood:

The layer that does not reach by sunligt.