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What is the source of the Sun's energy?
Nuclear fusion
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Which is a method of measuring the distance to stars?
Parallax
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What stops astronomers from observing the night sky in a city?
Too much light pollution
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How old is the Universe?
14000 million years old
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How can geologists gather evidence about the age of rocks?
Evidence can be gathered by looking at cross-cutting features.
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The outside of the Earth consists of:
Tectonic plates.
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What causes seafloor spreading?
Movement in the solid mantle
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Where are volcanoes and earthquakes likely to happen?
At the edge of tectonic plates.
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The vibrations detected from the site of an earthquake are called:
Seismic waves
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What are the layers in the Earth, starting from the middle?
Core, mantle, crust.
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What can we say if the vibrations in a wave are in the same direction as the direction of travel?
It must be a longitudinal wave
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The distance from one wave crest to the next is called:
The wavelength
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What is the unit of frequency?
hertz (Hz).
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Which type of wave can be detected on the other side of the Earth from an earthquake
P-waves
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Other cards in this set

Card 2

Front

Which is a method of measuring the distance to stars?

Back

Parallax

Card 3

Front

What stops astronomers from observing the night sky in a city?

Back

Preview of the front of card 3

Card 4

Front

How old is the Universe?

Back

Preview of the front of card 4

Card 5

Front

How can geologists gather evidence about the age of rocks?

Back

Preview of the front of card 5
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