Some natural wonders are not just beautiful places. They
help the earth. The Great Barrier Reef of Australia is one.
The whole reef is alive! Tiny sea animals make coral. The
coral builds up into
reefs
under water. These huge reefs
can be seen from space. Many kinds of sea plants live in the
reefs. Thousands of kinds of fish and animals also live there.
The Great Barrier Reef helps keep the ocean healthy.
7
Chapter
2
