The __________ stretches beyond the atmosphere to about 50 km,above the Earth's surface.
Troposphere
Exosphere
Stratosphere
Mesosphere
Clouds and precipitation form in
Thermosphere
Ionosphere
The lower portion of atmosphere contains
Oxygen
Nitrogen
Hydrogen
Argon
Which is the coldest layer in the atmosphere?
Hydrosphere
___________ keeps the Earth's surface warm at night.
The height of ______________ above the Earth's surface varies from place to place.
None of these
Which is the closest layer to the Earth's surface?
Biosphere
_________ is calmer than the troposphere and has little water vapour.
_________ extends to a height of about 1050 kilometers.
The first layer is called the
