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Unit 1, Chapter 1 Vocabulary Lyndon Cobb atmosphere the air surrounding density the amount of mass in a crevasse [kru-VAWS] a deep the planet (1.1) certain volume; how tightly packed together the material is in a substance (1.2; 8.1) crack in a glacier (1.3) hydrosphere all of the water on Earth including that in the atmosphere and lithosphere (1.1) lithosphere [LITH-oh-sfeer] the solid rocky ground of Earth’s crust (1.1) water cycle the evaporation of water into a gas in the atmosphere and the precipitation of water in the air as it falls back to Earth in the form or rain or snow (1.1) freezing point the temperature at which a substance freezes or solidifies (1.2; 7.1) salinity [suh-LIN-i-tee] the amount of salt dissolved in a specific amount of water (1.2) drainage basin the area of land from which water drains into a certain body of water (1.3) glacier a large compressed mass of ice and snow that does not melt away in the summer (1.3) global warming the increase in the average temperatures of Earth’s oceans and air near Earth’s surface (1.3) gravity the force that pulls all masses toward the centre of Earth or any large mass (1.3) ground water precipitation that falls on land and sinks out of sight and remains in cracks underground (1.3) iceberg a large chunk of ice that has broken off a glacier and floats in the ocean (1.3) run-off precipitation that falls to land and flows into creeks, streams, and rivers and eventually into the ocean (1.3) Page 1 of 1