hydrology: the branch of science concerned with the properties of the earth's water, and especially its movement in relation to land.
Noun - Water tracing is a technique used to investigate underground hydrology, and can provide this crucial missing information.
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geosphere: includes the rocks and minerals on Earth
Noun - Appreciable amounts of nitrogen are present in the atmosphere, biosphere, hydrosphere, and geosphere.
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planet: a celestial body moving in an elliptical orbit around a star.
Noun - What planet is he on? There are 8 planets in the solar system.
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hydrosphere: all the waters on the earth's surface, such as lakes and seas, and sometimes including water over the earth's surface, such as clouds.
Noun - . Lakes and rivers are important sources of freshwater in the earth's hydrosphere.
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atmosphere: the envelope of gases surrounding the earth or another planet.
Noun - The spacecraft disintegrated as it entered the Earth's atmosphere
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meteorology: the branch of science concerned with the processes and phenomena of the atmosphere, especially as a means of forecasting the weather.
Noun - Meteorology is the science of the weather.
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biosphere: the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.
Noun - All of the ecosystems in the world make up the biosphere
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rocks: a large mass of stone forming a cliff, promontory, or peak.
Noun - If they didn't own the ore mines, they'd be using rocks to fight.
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geology: the science that deals with the earth's physical structure and substance, its history, and the processes that act on it.
Noun - There are museums of mineralogy and geology, a lower school of mining, model room and scientific library.
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chemicals: a compound or substance that has been purified or prepared, especially artificially.
Noun - Officials claim the chemical poses no real threat.
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long periods: A long period is usually defined as one that lasts more than seven days.
Noun - This long period only gives women.
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dinosaurs: a fossil reptile of the Mesozoic era, in many species reaching an enormous size.
Noun - We reconstructed what the dinosaur looked like from a few of its bones.
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geography: the study of the physical features of the earth and its atmosphere, and of human activity as it affects and is affected by these, including the distribution of populations and resources, land use, and industries.
Noun - The geography of Northern Italy is described in several popular guide books.