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开始学习

问题		答案
Earth 开始学习		the planet we live on
sandstone 开始学习		red, brown, or orange rock made from sand that has become hard; we use it for building
granite 开始学习		very hard rock which comes from volcanoes, made of small pieces of different colors; we use it for building
limestone 开始学习		grey rock which can contain fossils; we use it for building
quarry 开始学习		a place where rocks are dug out of the ground
collect 开始学习		to find things and keep them together
diamond 开始学习		very hard, clear rock used in jewelry and for cutting hard objects
quartz 开始学习		hard, shiny rock- clocks and radios use quartz
marble 开始学习		hard, smooth, white rock; we use it for building and making statues and tiles
slate 开始学习		hard rock, often blue, grey or purple, which breaks easily into flat thin pieces; we cut it to make roof tiles
soil 开始学习		the natural material on the surface of the Earth in which plants grow
sandy 开始学习		covered with sand or made mostly of sand
sand 开始学习		loose brown material made from very small pieces of rock
clay 开始学习		a type of heavy sticky soil
stone 开始学习		a small piece of rock
natural 开始学习		comes from nature; not man-made
man-made 开始学习		made by people; not found in nature
rock 开始学习		rock hard part of the Earth's surface

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