Earth's Moon
What does the collision-ring theory best describe?
how the moon formed
Which planets experience a greenhouse effect?
Venus & Earth
True or False
Earth is unique in our solar system for having liquid mercury on its surface.
false; Earth is unique in our solar system for having liquid water on its surface.
Saturn's rings are made mostly of?
chunks of ice and rock.
Which is the most massive and largest of all outer planets?
Jupiter
True or False:
The highlands cover a little of the moon's surface.
false; The highlands cover most of the moon's surface.
Some regions of Mars have giant ________.
volcanoes
Which is the smallest terrestrial planet?
Mercury
True or False:
All the gas giants' atmospheres are made up primarily of helium and oxygen.
false; All the gas giants' atmospheres are made up primarily of helium and hydrogen.
Because the four outer planets are so large, they are often called _________.
gas giants
Craters were caused by the impact of?
meteoroids
Aside from Earth, which inner planet once had liquid water on its surface?
Mars
__________ makes up about 20% of Earth's atmosphere.
Oxygen
Which planet's axis is tilted at an angle of about 90 degrees from the vertical?
Uranus
True or False:
Neptune's blue color comes from methane in its atmosphere.
true
The moon's average density is similar to the density of the ________ outer layers.
Earth's
True or False:
The thick clouds on Venus are made mostly of carbonic acid droplets.
false; The thick clouds on Venus are made mostly of sulfuric acid droplets.
Venus and Earth are alike in terms of ?
size and density
True or False:
Temperatures decrease tremendously from the outer to inner layers of the gas giants.
false; Temperatures increase tremendously from the outer to inner layers of the gas giants.
A(n) ______ is a thin disk of small particles of ice and rock.
ring
At 3,476 kms, the moon's diameter is slightly less than the distance across?
the United States
True or false
Mercury rotates so slowly that its day is longer than its year.
false; Venus rotates so slowly that its day is longer than its year.
All the inner planets have an atmosphere except?
Mercury
True or false:
Space telescopes such as Cassini have revealed many details of the outer planets.
false; Space probes such as Cassini have revealed many details of the outer planets.
What characteristics do all outer planets have?
they have many moons