Unit 1 Module 1 Key Words 4.0 / 5 based on 1 rating ? GeologyEarth StructureASOCR Created by: Gabby-ACreated on: 15-02-16 13:28 Solar System The sun, planets, their moons, comets and asteroids 1 of 18 The Sun A star composed of hydrogen and helium - It is the largest object in the Solar System and contains more than 99.8% of the total mass 2 of 18 A Planet A sizable object orbiting a star 3 of 18 A Moon A natural satellite orbiting a planet 4 of 18 Asteroids Rocky objects which failed to form a planet 5 of 18 Meteorites Fragments of rock, which fall to Earth from space 6 of 18 A Comet Composed of ice and dust - The outer layer melts into water vapour as it gets closer to the sun 7 of 18 A Rheid A solid material that flows 8 of 18 Peridotite An ultramafic igneous rock composed of the minerals olivine and pyroxene with a coarse crystal size 9 of 18 Olivine A dense, ferromagnesian silicate mineral 10 of 18 Partial Melting Where a proportion of the minerals will have a lower melting point, allowing them to melt while the rest remains solid 11 of 18 Kimberlites Fine-grained, ultramafic igneous rocks 12 of 18 A Xenolith A fragment of ‘foreign’ rock included in an igneous rock, which has come from a different source 13 of 18 An Ophiolite A section of oceanic crust and upper mantle broken off and attached to the edge of a continent during plate movement 14 of 18 Palaeomagnetism Ancient magnetism preserved in rocks 15 of 18 A Magnetic Anomaly A value for the Earth’s magnetic field that is different from the expected value 16 of 18 Magnetic Inclination The angle of dip of the lines of a magnetic field - The angle with the horizontal made by a compass needle 17 of 18 Remanent 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 18 of 18
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