A coral reef is an underwater ecosystem composed of colonies of coral polyps held together by ____________.
Magnesium Carbonate
Calcium Oxide
Calcium Carbonate
Shallow water corals need sunlight and an optimum temperature range of _________ to grow.
17-25 ºC
20-29 ºC
20-25 ºC
Corals form a symbiotic relationship with photosynthetic algae called __________, which live in their tissues, these algae give the corals their amazing colors.
Zooxanthellae
Blue-Green Algae
Rhodophyta
Coral belongs to the animal phylum Cnidaria, which also includes sea anemones and _________.
Clown Fish
Sea Cucumber
Jellyfish
Coral reefs are known as __________ of the sea as they compose 25% of marine species of the world.
Grasslands
Rainforests
Evergreen forests
Corals are not just warm-water creatures, there are also deep-sea corals that live up to depths of _________ and in temperatures as low as 4ºC.
2,000m
1,000m
1,500m
Deep-sea corals are more fragile and live off the dead as _____________ is not possible . Even with scant food supply some of them can live up to 100 years.
Acidification
Eutrophication
Photosynthesis
Coral reefs are the largest structures on earth of _________ origin.
Biological
Chemical
Synthetic
Coral reefs grow at a very slow rate of just two ________ per year.
Centimeters
Millimeters
Meters
There are three different types of coral reef formations namely barrier reefs, ________, and fringing reefs.
Coral reefs
Coral atolls
Fringing atolls
The Great Barrier Reef of Australia spans 1600 miles composing over _______ individual reefs and 900 islands and can even be seen from space.
1,900
900
2,900
The second-largest coral reef in the world is the Mesoamerican Reef of the ___________ basin, it protects people of Mexican to Central American coast from hurricanes.
Caribbean
Pacific
Aleutian
Which year was declared as the International Year of the Reef by the U.S. Departments of State and Commerce along with the world nations?
1989
2016
1997
Scientists have just begun to research the medicinal aspects of the Corals reefs but they are already being used in the treatment of cancer and _______.
HIV
Diabetes
Malaria
Mother corals or Older Corals do have children called _________ that free-float until they attach themselves to a harder surface.
Pahoehoe
Planulae
Polyps
Coral Triangle is a collection of islands in the__________ region that homes to at least 500 coral species.
Indo-Pacific
Atlantic
Arctic
Corals are under serious threat as a result of rising levels of _________. In the last 30 years, we've lost about 50 percent of global corals.
Ozone
Particulate matter
Carbon dioxide
_________ is an international non-profit organization focused on coral reef conservation.
WWF
SECORE
Greenpeace international
Coral reefs also play an important role in environment stability by helping to manage the ____________ levels.
Carbon monoxide
Oxygen
Carbon dioxide
The most biodiverse region of the world’s oceans is the ___________ of West Papua that nurtures a grand total of 574 coral species.
Apo Reef
New Caledonian Barrier Reef
Bird’s Head Peninsula Coral Reef
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