Hot deserts are found in the western margins of the continents in the?

In which reservoir is dissolved carbon dioxide abundant?

The third expansion of growth was stimulated by?

Matter that organisms require for life processes are called?

Which sphere includes the physical elements of the earth's surface, crust and interior?

Which biome has long cold winters and short warm summers?

Main reason for the current increase in extinction is?

The burning of fossil fuels has the greatest and most direct impact on?

Which is the most abundant gas in the atmosphere?

The biome receiving high precipitation year- round?