Summarize the ways in which human activities have affected the world’s deserts, grasslands, forests, and mountains.

Explanation:

Grassland:

Conversion to croplands, release of CO2 to atmosphere from burning grasslands, overgrazing by livestock and oil production and off road vehicles in arctic tundra

Desert:

Large deserts cities, destruction of soil and underground habitat by off road vehicles, soil salinization from irrigation, depletion of groundwater land disturbance and pollution from mineral extraction

Forests:

Clearing for agriculture, livestock grazing, timber urban development, conversion of diverse forests to tree plantations and damage from off road vehicle  and Pollution of forests streams

Mountains:

Agriculture and timber and mineral extraction, hydroelectric dam and reservoir, increasing  tourism air pollution from urban areas, soil damage from off road vehicles and water supply threatened by glacial melting

river is shown in this type of map