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