earth science 11 Flashcards
what is humus
is a dark colored material that is important for the growth for plants. some of the chemicals
weathering
The breaking down of rocks and other materials on the earth surface is called weathering
mechanical weathering
weathering that dose not invlove changes in the chemical makeup of rocks
oxidation
the process in which oxygen chemically combines with another substance
stable rock
a rock composed of minerals that resi`st chemicals weathering
bedrock
the layer of rock beneath the soil
topsoil
the soil in the A horizon or uppermost layer of mature soil
transported soil
soil that is moved away from its place of origin
subsoil
the soil in the B horizon or middle layer of soil
soil profile
a cross section of soil horizon
root pry
the breaking apart of rocks caused by the growth of plants root
rock
a hard substance composed of one or more minerals or minerallike substance
residual soil
soil that memains on top of the rock from which it was formed
pore space
a space between soil particals
organic rock
a sedimentary rock that is formed either directly or indirectly from materials that was once alive
load
the amount of sediment carried by stream
leaching
the process in which water washes minerals from the topsoil to the subsoil
intrusive rock
an igneous rock formed by magma
igneous
formed from molten rock
erosion
the process bu which the products of weathering are moved from one place to another
depostion
the process by which sediments are laid down in new location
