793969
Description
Flashcards by Holly Hutchings, updated more than 1 year ago
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Created by Holly Hutchings
about 12 years ago
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| Question | Answer |
| what is the source of the suns energy? | Nuclear fusion |
| Name a method that measures the distance to stars | Parallax |
| What stops astronomers from observing the night sky in a city? | Too much light pollution |
| How old is the universe? | 14000 million years old |
| which is biggest out of an a)planet b)asteroid c)comet | a)planet |
| Is deeper rock older or younger than the rock above it? | older |
| what does the outside of the earth consist of? | tectonic plates |
| what was Wegener's evidence for the theory of continental drift? | The continents seemed to fit together |
| Why was Wegener's theory not accepted? | because no movement of the continents could be measured |
| what causes seafloor spreading? | movement in the solid mantle |
| where are volcanoes and earthquakes likely to happen? | at the edge of tectonic plates (the boundaries) |
| what is evidence for seafloor spreading? | Magnetic stripes on the seafloor |
| what are the vibrations detected from the site of an earthquake called? | seismic waves |
| what are the layers in the earth, starting from the middle? | core, mantle, crust |
| 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 |
| what is the distance from one wave crest to the next called? | the wavelength |
| What is the unit of frequency? | Hertz, Hz |
| What is the speed of a wave with a wavelength of 2 metres and frequency of 6 hertz? | 12 m/s |
| Which type of wave can be detected on the other side of the Earth from an earthquake? | Only P-waves can be detected on the other side of the Earth from an Earthquake |
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