P1 0.0 / 5 ? PhysicsAstronomyEarth in spaceThe Earth in the UniverseGCSEOCR Created by: meganhiggins122Created on: 29-04-15 20:40 What is the source of the Sun's energy? Nuclear fusion 1 of 14 Which is a method of measuring the distance to stars? Parallax 2 of 14 What stops astronomers from observing the night sky in a city? Too much light pollution 3 of 14 How old is the Universe? 14000 million years old 4 of 14 How can geologists gather evidence about the age of rocks? Evidence can be gathered by looking at cross-cutting features. 5 of 14 The outside of the Earth consists of: Tectonic plates. 6 of 14 What causes seafloor spreading? Movement in the solid mantle 7 of 14 Where are volcanoes and earthquakes likely to happen? At the edge of tectonic plates. 8 of 14 The vibrations detected from the site of an earthquake are called: Seismic waves 9 of 14 What are the layers in the Earth, starting from the middle? Core, mantle, crust. 10 of 14 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 11 of 14 The distance from one wave crest to the next is called: The wavelength 12 of 14 What is the unit of frequency? hertz (Hz). 13 of 14 Which type of wave can be detected on the other side of the Earth from an earthquake P-waves 14 of 14
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