Earth's systems
which idea claims Earth's forces operated at the same rate in the past
uniformitarianism
the theory that earths plates move causing earthquakes and volcanoes is called what
plate tectonics
what deep valleys with steep sides are carved by rivers
canyons
what is a strip of land connecting two larger landmasses with water on both sides
isthmus
what are the three main types of resources mined by humans
metals nonmetal minerals fossil fuels
which layer of gases surrounds earth
atmosphere
what is the Earth's thin outer layer called
crust
which process breaks rock into smaller pieces?
weathering
name three major landforms
mountains, plains, and plateaus
farmers who grow only enough food for their families are called what?
subsistence farmers
which system includes all life on earth
biosphere
what molten rock is found in the mantle
magma
which process removes rock material
erosion
what type of mountains are the Sierra Nevada mountains
fault-block mountains
what are the two major branches of agriculture
farming and animal husbandry
what are the 4 physical systems of earth
atmosphere lithosphere biosphere hydrosphere
which two metals likely make up earths core
iron and nickel
what process creates fjords
glaciation
a group of islands is called what
archipelago
which metal is mined more than any other metal
iron
which is the solid rocky part of earths crust
lithosphere
what is the process where heat rises and cools inside the mantle
convection
what is the most powerful agent of erosion
what do we call rivers that feed other rivers
tributary
cultivation of seafood in controlled environments is called what
aquaculture