78308
Description
Flashcards by siobhan.quirk, updated more than 1 year ago
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Created by siobhan.quirk
over 11 years ago
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| Question | Answer |
| Define the Solar System | is the Sun, planets, their moons, comets and asteroids |
| Define the Sun | a star composed of hydrogen and helium. It is the largest object in the Solar Sysem and contains more then 99.8% of the total mass |
| Define a planet | a sizable object orbiting the sun |
| Define moon | a natural satellite orbiting a planet |
| Define asteroids | rocky objects which failed to form a planet |
| Define meteorites | fragments of rock which fall to Earth from space |
| Define a comet | composed of ice and dust. The outer layer melts into water vapour as it gets closer to the Sun. |
| Define rheid | a solid material that flows |
| Define peridotite | an ultramafic igneous rock composed of the minerals olivine and pyroxene with a coarse crystal size |
| Define olivine | a dense, ferromagnesian silicate mineral |
| Define partial melting | where a proportion of the minerals will have a lower melting point, allowing them to melt while the rest remains solid |
| Define kimberlites | fine-grained, ultramafic igneous rocks |
| Define xenolith | fragment of foreign rock included in an igenous rock which has come from a different source |
| Define ophiolite | a section of oceanic crust and upper mantle broken off and attached to the edge of a continent during plate movement |
| Define palaeomagnetism | ancient magnetism preserved in rocks |
| Define magnetic anomaly | a value for the Earth's magnetic field, which is different from the expected value |
| Define magnetic inclination | is the angle of dip of the lines of a magnetic field. It is the angle with the horizontal made by a compass needle. |
| Define remnant magnetism | magnetism shown by rocks due to the alignment of their magnetic minerals according to the Earth's magnetic field at the time of their formation |
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