Basic Facts
Composition & Structure
Orbit & Rotation
The Moon
Habitability & Culture
100
The Earth, The World, The Blue Planet, and Terra (Latin)
What are some other names for Earth?
100
Sphere
What is Earth's shape?
100
The Earth and other planets orbit around the sun.
What is Heliocentrism?
100
A relatively large, terrestrial, planet-like satellite, with a diameter about one-quarter of the Earth's
What is the moon?
100
Biosphere
What is the sphere of life on Earth?
200
71%
What is the percentage of saltwater on Earth?
200
Europe, North America, South America, Asia, Antarctica, Africa, and Australia
What are Earth's continents?
200
Moving West
What is the main apparent motion of celestial bodies in the Earth's sky?
200
3,474.8 km
What is the Moon's diameter?
200
Biomes
What divides the Biosphere?
300
North and South Poles
What are the Earth's Poles
300
Mechanically rigid outer layer of the Earth, the lithosphere, broken into pieces.
What is plate tectonics?
300
365 Days
What is the time in which it takes the Earth to revolve around the sun?
300
From the collision of a Mars-size protoplanet called Theia with the early Earth.
What formed the moon?
300
1/4 of the world
What is the amount of Earth that is sustainable for humans?
400
About 200 independent countries (193 in the U.N.)
What is the number of countries on Earth?
400
Water on Earth
What is the hydrosphere?
400
24 hours
What is a solar day?
400
27.32 days
What is the time it takes the moon the revolve around the Earth?
400
7 billion
What is the number of humans on Earth?
500
78.08% nitrogen (N2) 20.95% oxygen (O2) 0.93% argon 0.038% carbon dioxide About 1% water vapor (varies with climate)
What is the make-up of the Earth's Atmosphere?
500
Is a layer of gases that may surround a material body of sufficient mass, and that is held in place by the gravity of the body.
What is atmosphere?
500
Counterclockwise
What is direction of Earth's orbit?
500
The Moon passing between the Sun and the Earth
What is a Solar Eclipse?
500
The measure of a planet's or a natural satellite's potential to sustain life.
What is planetary habitability?
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