the movment of sediment; removes pieces of Earth from one pace and builds land in another; agents: gravity, ice, wind, water

a large group of stars, dust and gases in the universe held together by gravity

small object made of ice with some gas, dust, and rock; a "tail" can appear as the comet revolves around the sun and is heated

nearly round objects that revolve around a star; in our solar system the planets that revolve around our Sun are; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

galaxy that is disc-shaped with a thin disk with long arms; gas and dust rotate around the central hub of the galaxy

outermost layer of Earth; least dense layer; thinnest layer; where we live

spin of Earth (or other Moon/planet) on its axis; takes 24 hours; causes day/night

layer of Earth between crust and core; thickest layer, partially molten (liquid)

moon phase that occurs when the Moon is between Earth and the Sun; the Moon cannot be seen because its lighted half is facing the Sun and its dark side faces Earth

show elevation of land with shape and spacing of contour lines; closer lines mean steeper slopes; flat places have widely spaced lines; series of increasingly smaller closed loops indicates hill or mountain

forms when other rocks are heated and squeezed together; requires heat and pressure

spin of Earth (or other Moon/planet) on its axis; takes 24 hours; causes day/night