At which point is crust neither created nor destroyed?
Scientists have detected an asteroid that is 700,000,000 km from Earth. About how many astronomical units is that?
How are S waves and surface waves similar?
The image shows an up-close view of a rock.

Which force keeps the planets from floating off into space?
Which measurement do geologists use to find the absolute age of once-living things?
Which list correctly names the three types of galaxies?
This is a map that shows hot spots around the world.

Which rock is an example of an organic sedimentary rock?
In which era did mammals emerge?
Which discovery did scientists make at mid-ocean ridges that caused them to conclude that new rock was being formed by molten material?
Which occurs just before a volcanic eruption?
When a volcano erupts, tiny particles from which of Earth’s spheres are released into the air?
Examine the image of the Hertzsprung-Russell diagram.

Which describes a feature of extrusive igneous rocks after formation?
What do scientists know about the future of the universe?
Look at this image of a star cluster.

Which is a difference between the Paleozoic and Mesozoic era?
Which statement accurately describes short-term environmental changes?
Look at the image of the moon.

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