astro quiz 7

On Mercury and the Moon, we notice that larger craters __________ smaller craters.

came before

What molecules dominated the Earth's primordial atmosphere?

carbon dioxide and water vapor

The best time to observe the moon to see its crater is during a ....

crescent moon

What factor most helps the Earth maintain a relatively constant temperature?

greenhouse gases

The surface of the moon is covered with a fine powder of pulverized rock called...

regolith

Where did Earth's oceans come from?

Rain from water vapor in the early atmosphere

The surface of the moon contains geologic evidence for ___________ on the moon in the past.

volcanoes

Where did the oxygen in our atmosphere come from?

photosynthesis of living organisms

The appearance of Earth's moon is nearly identical to ...

Mercury

Which cities would be covered with water if the Greenland Ice Sheet melted completely?

Miami and Amsterdam

What initiated the runaway greenhouse effect on Venus?

The gradual warming of the Sun

The bright circles around impact craters are called ...

ejecta

Mercury gets incredibly hot and incredibly cold because ...

it does not have an atmosphere.

Mercury has a network of strange wrinkles across its surface called ...

scarps

Why doesn't Mars have active volcanoes today?

the planet lost its internal heat to cold space