Rotation
How long does it take for Earth to rotate on its axis?
24 hours
What does the Earth revolve around?
the Sun
What is the force that keeps us on Earth?
gravity
Living parts of an ecosystem
Biotic Factors
What is all the air on Earth
atmosphere
What does Earth rotate around?
it's axis
How long does it take Earth to revolve around the Sun?
365 1/4 days
What effect does the moon's gravity have?
It causes the tides
Nonliving parts of an ecosystem
Abiotic Factors
What is all the life on Earth
biosphere
How many rotations does Earth make in one year?
365 rotations
What does the Moon revolve around?
Earth
Which two things affect the force of gravity?
mass and distance
The main source of energy in an ecosystem comes from what?
the Sun
What is all the water on Earth
hydrosphere
How long does it take the moon to make one rotation on its axis?
about 28 days
How long does it take the Moon to revolve around Earth?
about 28 days
Which has more gravity-- Mars or Earth?
Mars
What are organisms that have been added to an environment that don't belong there called?
An invasive species
What is all the land on Earth?
geosphere
Earth rotates on its axis and its axis is
tilted
What do Phobos and Deimos revolve around?
Mars
Because of gravity, would you weigh more or less if you went to Mars?
less
Give three examples of abiotic factors in an ecosystem.
Sun, rain, rocks, water, shade, etc.
All four major Earth systems do what together?
interact