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.
2 of 13
in which 3 ways do tectonic plates move?
they move past each other, towards each other or slide past each other.
3 of 13
what are the 3 major features that occur at plate boundaries?
volcanoes, earthquakes and mountain formations.
4 of 13
what heats the core?
radioactive decay
5 of 13
how old is the sun?
5000 million years old?
6 of 13
where does the sun's energy come from?
energy is released during nuclear fusion.
7 of 13
what are the 2 ways of working out the distances to stars?
parallax and brightness
8 of 13
what is light pollution?
man made pollution that makes it harder to see stars at night.
9 of 13
what is a light year?
the distance travelled by light in a year.
10 of 13
what is the frequency of waves?
the number of waves passing a point per second.
11 of 13
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.
12 of 13
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.
13 of 13
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
Card 4
Front
what are the 3 major features that occur at plate boundaries?
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