
1) Experimental rocket 2) From 4 to 11 miles high 3) French word used in English 4) Layer 5) The lowest atmospheric layer
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1) Tropo
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https://www.crosswordclues.com/clue/troposphere

Lower part of the atmosphere, extending from the surface up to a height varying from about 7 to 9 km at polar regions to approximately 17 km in tropics. The troposphere is characterized by decreasing temperature with height, appreciable vertical wind motion, appreciable water vapor content, and weather.
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http://nsidc.org/arcticmet/glossary/troposphere.html

A division of the Earth's atmosphere extending from ground level to altitudes ranging 5-10 miles.
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http://www.braeunig.us/space/glossary.htm

lowest region of the atmosphere, bounded by the Earth beneath and the stratosphere above, with its upper boundary being the tropopause, about 10–18 ... [13 related articles]
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http://www.britannica.com/eb/a-z/t/84

the lower part of the Earth's atmosphere, extending upwards from the Earth's surface, in which the temperature decreases with height except in certain local layers of temperature inversion; this part of the atmosphere extends to an altitude of about 9 km at the poles and 17 km at the equator
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=705-05-01

Lowest atmospheric layer, between the surface and tropopause.
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http://www.encyclo.co.uk/local/20130

the layer of the Earth's atmosphere about 10km from the surface. The air in the troposphere is well mixed and it is where the clouds are mostly to be found.
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http://www.encyclo.co.uk/local/20842

Layer of the atmosphere that contains about 95 per cent of the Earth's air and extends about six to 17 km up from the Earth, depending upon latitude and season.
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http://www.encyclo.co.uk/local/21291

The layer of the atmosphere closest to the earth's surface.
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http://www.encyclo.co.uk/local/21292

The layer of the atmosphere from the earth's surface up to the tropopause, characterized by decreasing temperature with height. It's the layer of the atmosphere where most of the weather occurs.
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http://www.encyclo.co.uk/local/22268

The lowest layer of the atmosphere and contains about 95 percent of the mass of air in the Earth's atmosphere. The troposphere extends from the Earth's surface up to about 10 to 15 kilometers. All weather processes take place in the troposphere. Ozone that is formed in the troposphere plays a significant role in both the greenho...
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http://www.encyclo.co.uk/visitor-contributions.php

(Learning Modules / Geography / Weather forecasting) The lowest level of the atmosphere where weather forms. The troposphere is characterised by temperatures that decline as you go higher up.
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http://www.encyclo.co.uk/visitor-contributions.php

Layer in the atmosphere found from the surface to a height of between 8 to 16 kilometers of altitude (average height 11 kilometers). The troposphere is thinnest at poles and gradually increases in thickness as one approaches the equator. This atmospheric layer contains about 80% of the total mass of the atmosphere. It is also the layer where the ma...
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http://www.physicalgeography.net/physgeoglos/t.html

The lower regions of a planetary atmosphere where convection keeps the gas mixed and maintains a steady increase of temperature with depth. Most clouds are in the troposphere.
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http://www.solarviews.com/eng/terms.htm

It is the lowest part, of the earth’s atmosphere in which most of the weather phenomena occur.
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http://www.vidyagyaan.com/general-knowledge/science/glossary-of-physics-ter

lower part of the atmosphere, extending from the surface up to a height varying from about 7 to 9 kilometers (4.3 to 5.6 miles) at polar regions to approximately 17 kilometers (10.6 miles) in tropics; characterized by decreasing temperature with height, appreciable vertical wind motion, appreciable water vapor content, and weather .
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https://nsidc.org/cryosphere/glossary?page=27

lowest layer of the atmosphere where weather takes place
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https://sciencetrek.org/sciencetrek/topics/weather/glossary.cfm

the lowest layer of the atmosphere and where weather occurs.
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https://serc.carleton.edu/eslabs/weather/glossary.html

The inner layer of the atmosphere below about 15 km, within which there is normally a steady decrease of temperature with increasing altitude. Nearly all clouds form and weather conditions manifest themselves within this region, and its thermal structure is caused primarily by the heating of the Earth's surface by solar radiation, followed by heat ...
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https://www.encyclo.co.uk/local/20128

The layer of the atmosphere lying below 10 km altitude. More information here.
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https://www.encyclo.co.uk/local/20751

The lower layer of the atmosphere in which the change of temperature with height is relatively large and decreases with an increase in height. The troposphere extends up to approximately 33,000ft.
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https://www.encyclo.co.uk/local/20784
noun the lowest atmospheric layer; from 4 to 11 miles high (depending on latitude)
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https://www.encyclo.co.uk/local/20974

The layer of the atmosphere from the Earth's surface up to the tropopause, characterized by decreasing temperature with height, appreciable vertical wind motion and considerable water vapour content. Most of what we sense as weather (most clouds, rain, etc.) occurs in the troposphere. Meteorologists subdivide the troposphere into the boundary layer...
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https://www.encyclo.co.uk/local/21131

Lower part of the Earth's atmosphere extending about 10.5 km/6.5 mi from the Earth's surface, in which temperature decreases with height to about -60°C/-76°F except in local layers of temperature inversion. The tropopause is the upper boundary of the troposphere, above which the temperature increases slowly with he...
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https://www.encyclo.co.uk/local/21221
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