38 terms

APES Friedland Chapter 8

the layer of the earth between the crust and the core
molten rock
located in the outer part of the mantle and is composed of semi-molten, ductile rock
a 60 mile think layer that includes the solid upper mantle as well as the crust
the outermost layer of the lithosphere
hot spots
places where molten material from the mantle reaches the lithosphere
plate tectonics
Earth's lithosphere is divided into plates, most of which are in constant motion
tectonic cycle
the sum of the processes that build up and break down the lithosphere
the process of one plate passing under another
a vent in Earth's surface that emits ash, gases, and molten lava
divergent plate boundaries
when oceanic plates move apart as if on a giant conveyor belt
seafloor spreading
when the magma rises up and outward, forming new rock. This process brings important elements such as copper & lead to the surface of the Earth
convergent plate boundaries
when plates move toward one another and collide, and the lighter layer goes on top of the heavier, subducted layer
transform boundary
a plate boundary where two plates move/slide past each other in opposite directions
a fracture in rock across which there is movement
fault zones
large expanses of rock where movement has occurred
sudden movements of Earth's crust followed by a series of shocks
the exact point on the surface of Earth directly above the location where the rock ruptures
richter scale
a measure of the largest ground movement that occurs during an earthquake
solid chemical substances with uniform structures that form under specific temperatures and pressures They are usually compounds
igneous rocks
rocks that form directly from magma. They are classified as basaltic or granitic [i.e granite, basalt]
sedimentary rocks
rocks that form when sediments like mud, sand, or gravel are compressed by overlying sediments. It forms over long periods of time. This layer often holds fossils [i.e. sandstone, limestone]
metamorphic rocks
rocks that form when sedimentary rocks, igneous rocks, or other metamorphic rocks are subjected to high temperatures and pressures [i.e. marble, quartzite]
physical weathering
Weathering in which solid rock is fragmented by mechanical processes that do not change its chemical composition.
chemical weathering
The process that breaks down rock through chemical changes
acid rain
rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water
the physical removal of rock fragments from a landscape or ecosystem
the accumulation or depositing if eroded material such as sediment, rock fragments, or soil
a mix of geologic and organic compounds. Often called "Earth's dynamic membrane"
parent material
the rock material underlying soil from which its inorganic components are derived
soil layers, a specific layer or stratum of soil or subsoil in a vertical cross section of land
O horizon
the top-most soil layer that has organic matter in various stages of decomposition
A horizon
the topsoil layer that is a zone of overlying organic material and underlying mineral material
B Horizon
a zone of accumulation of metals and nutrients, commonly known as subsoil
C horizon
the least weathered soil horizon that is similar to the parent material
cation exchange capacity
the ability of a particular soil to absorb and release cations. This is sometimes referred to as the nutrient holding capacity
base saturation
a measure of the proportion of soil bases to soil acids, expressed as a percentage
soil degradation
the loss of some or all of the ability of soils to support plant growth

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