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