P1-The Earth in the Universe

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when was the earth formed?
4500 million years ago
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why did no one believe Wegener's theory?
he was not a geologist. there was limited evidence. there was simpler explanations e.g. a landbridge. the movement of tectonic plates could not be detected.
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in which 3 ways do tectonic plates move?
they move past each other, towards each other or slide past each other.
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what are the 3 major features that occur at plate boundaries?
volcanoes, earthquakes and mountain formations.
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what heats the core?
radioactive decay
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how old is the sun?
5000 million years old?
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where does the sun's energy come from?
energy is released during nuclear fusion.
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what are the 2 ways of working out the distances to stars?
parallax and brightness
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what is light pollution?
man made pollution that makes it harder to see stars at night.
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what is a light year?
the distance travelled by light in a year.
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what is the frequency of waves?
the number of waves passing a point per second.
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what is the big bang theory and when was it predicted to have happened?
its the theory that the universe started with an explosion about 14 billion years ago.
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which waves can travel through solids and liquids and which cant?
p-waves can travel through solids and liquids but s-waves can only travel through solids.
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Other cards in this set

Card 2

Front

why did no one believe Wegener's theory?

Back

he was not a geologist. there was limited evidence. there was simpler explanations e.g. a landbridge. the movement of tectonic plates could not be detected.

Card 3

Front

in which 3 ways do tectonic plates move?

Back

Preview of the front of card 3

Card 4

Front

what are the 3 major features that occur at plate boundaries?

Back

Preview of the front of card 4

Card 5

Front

what heats the core?

Back

Preview of the front of card 5
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