Reefs are built by _____, tiny, soft-bodied animals related to jeyllyfish.
sea horses
starfish
coral polyps
fish
If we take care of reefs, they can _____ or come back.
rebuild
tear down
die
break
Cyanide fishing releases liquid cyanide, a deadly _____, into the reef.
robot
chemical
hook
fishing pole
Global warming has caused many reefs to become ____.
better
sick
bigger
healthy
When coral polyps die, they leave behind a material called ______.
marble
limestone
clay
brick
Coral reefs like to live in _____ waters, which means they are not too deep.
shallow
polluted
dirty
deep
1,000,000,000,000 =
a google
a million
a billion
a trillion
The greatest limestone structures are _____.
castles
coral reefs
churches
pyramids
Some fishing methods have ____ effects on reefs.
negative
friendly
hungry
illegal
Coral reefs _____ a small 25% of ocean life.
lose
swim
construct
occupy
Coral reefs need our help to stay healthy, so we should be kind to the ocean and ______ trash into it.
sometimes throw
always throw
not throw
Coral reefs are ______ because they have bright and brilliant colors.
the same
remarkable
boring
_________ means taking care of nature, like coral reefs, so they stay healthy and happy.
Pollution
Construction
Conservation
Aquariums
Coral reefs are _____ when people take coral from the reef to make things.
helped
damaged
protected
built up
Limestone was used to construct ________;
The Statue of Liberty
The Great Pyramids of Egypt
my house
The Great Wall of China
The coral reefs' _____ colors come from the corals
brilliant
dark
white
dull
Many different animals ____ coral reefs.
forget
occupy
leave
kill
Coral reefs are like colorful underwater ______ where many different animals and plants live.
cities
clouds
games
holes
Most coral reefs are found in warm, shallow ______.
pools
lakes
bathtubs
oceans
A tank or building where sea animals are kept is an ____.
museum
library
courthouse
aquarium