biologist Word Definition Picture Sentence a scientist who studies living things biologist The biologist explained to our class that a giant sequoia tree does not produce seeds until it is 150 years old.

bluff Word Definition Picture Sentence a high steep slope or cliff From the bluff, a person can see far out over the ocean.

lagoon Word Definition Picture Sentence a pond or small lake, especially one connected with a larger body of water lagoon From on top of the hill, we could clearly see the lagoon.

massive Word Definition Picture Sentence big and heavy We had a lot of trouble trying to move the massive piano through the doorway.

rumbling Word Definition Picture Sentence making a deep, heavy, continuous sound rumbling During the rain storm, we saw the lightning and then heard the rumbling sound of thunder.

tropical Word Definition Picture Sentence regions where the sun shines directly overhead, and it is hot and humid tropical Rainforests grow in many tropical countries such as Brazil.