Landforms. Glossary

Archipelago: An archipelago is a group or chain of islands clustered together in a sea or ocean.

Atoll: An atoll is a ring (or partial ring) of coral that forms an island in an ocean or sea. The coral sits atop a submerged volcanic cone.
  
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Speller and Quizz 

Cameron's Long Way Down: Mariana Trench

The Mariana Trench or Marianas Trench is the deepest part of the world's oceans. It is located in the western Pacific Ocean, to the east of the Mariana Islands. The trench is about 2,550 kilometres (1,580 mi) long but has an average width of only 69 kilometres (43 mi). More

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The Mariana Trench. National Geographic

Time Zones

What Are They & Why Do We Need Them?

We measure the day by saying that the sun is at it's highest point at 12 o'clock, midday. Because the earth spins, as it travels around the sun, one half of the earth is in darkness and one half in light, all the time. This brings us to a problem. If it is midday where you are, on the opposite side of the earth, it is dark, so what time is it on the opposite side of the world?

Theory

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