17 questions • ScienceWhat is the name of the supercontinent that existed about 300 million years ago? | |||||
|---|---|---|---|---|---|
Pangaea | |||||
What percentage of Earth's surface is covered by water? | |||||
About 71% | |||||
What is the deepest known point in Earth's oceans? | |||||
The Challenger Deep in the Mariana Trench | |||||
Which layer of Earth's atmosphere contains the ozone layer? | |||||
The stratosphere | |||||
What is the approximate age of Earth? | |||||
About 4.54 billion years | |||||
What is the name of the imaginary line that divides Earth into the Northern and Southern Hemispheres? | |||||
The Equator | |||||
What is Earth's only natural satellite? | |||||
The Moon | |||||
What is the term for the point on Earth's surface directly above an earthquake's origin? | |||||
The epicenter | |||||
What is the molten rock beneath Earth's surface called? | |||||
Magma | |||||
What is the natural light display in the sky, commonly seen in polar regions, called? | |||||
Aurora (Aurora Borealis or Northern Lights) | |||||
Where did the asteroid that contributed to the extinction of the dinosaurs strike Earth? | |||||
In the Yucatán Peninsula, Mexico | |||||
What protects Earth from harmful solar wind and cosmic radiation? | |||||
Earth's magnetic field | |||||
What are the openings in Earth's surface through which lava, ash, and gases are ejected called? | |||||
Volcanoes | |||||
Which massive marine predator from the past is believed to have been even larger than the great white shark? | |||||
Megalodon | |||||
What type of organisms were the first known life forms on Earth? | |||||
Single-celled organisms, such as bacteria | |||||
Where do rain clouds typically form? | |||||
In the atmosphere, when warm, moist air rises and cools | |||||
What is the approximate circumference of Earth at the equator? | |||||
About 40,075 kilometers | |||||
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