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Why is it reasonable to conclude that the internal structure and evolution of Venus are basically Earthlike?
They have similar masses and sizes.
In the time between two closest approaches to Earth, Venus rotates almost exactly five times relative to the sun. The consequence of this is that:
Venus always presents the same face to Earth at inferior conjunction.
Because of its slow rotation period, Venus:
presents the same side to Earth at each closest approach.
A surprise from the Pioneer Venus photos was that:
the clouds rotate around the planet in only four days, very unlike the slow surface rotation.
What is thought to have caused the craters on Venus?
Most are volcanic in origin; some are due to meteoritic impacts.
A characteristic of sheild volcanoes is the formation of a crater at the summit which occurs when:
the lava withdraws and the surface collapses.
What is the result of the Greenhouse effect on the surface environment of Venus?
It has raised the surface temperature by hundreds of degrees Celsius
If Venus once had an ocean, where did it go?
The water broke into hydrogen, which escaped to space, and oxygen, which became trapped in the planet's surface rocks.
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