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