### location | region | crust:

New crust
* is created at the mid-ocean ridge.
* is formed as molten rock is forced upward into the gap
  - or destroyed at the boundaries between plates

Ocean crust
* is basaltic with uniform p wave velocities
  - denser than continental crust
  - recycled back into the asthenosphere at the subduction zones
  - returned to the mantle through subduction
* sinks into the mantle at deep-sea trenches.

### location | region | crust:

Oceanic crust
* All oceanic crust is produced at spreading centers by a very specialized process.
* carries sediments that have been deposited on the oceanic floor.
* consists mainly of basaltic rock with an thin veneer of sediment.
* has insignificant amounts of radiogenic elements.
* is also much thinner than continental crust
* is composed of basalt, the result of partial melting of the mantle
  - primarily of basalt and gabbro
  - created at divergent plate boundaries
* is destroyed at convergent plate boundaries
  - made primarily of a rock called basalt
* is more active than continental, but it is thinner
  - subducted back into the mantle
* is the layer below the deep ocean basins
  - rock type
* is thicker than continental crust and is made of basalt
  - thin and low, but it's dense
* is, in general, thin and dense.

Soil crust
* Most soil crust forms physical barriers.
* consist of cyanobacteria, mosses, and lichens.
* forms barriers
* is important to preventing wind erosion and conserving water
  - vegetation in the desert because it prevents runoff and conserves water
* prevent erosion.

Destination
* are goals.
* have adults
  - few visitors
  - opportunity
  - popularity
* is an end
  - the physical name of an external file or aggregate file location, or of a device

Different region
* have advantage
  - comparative advantage
* have different air pressures, even at the same altitude
  - climate dynamics and different distributions of daily rainfall
  - names for the same organism
  - distinctive seasonal patterns
  - their own traditions and ways to utilise their forest resources

Equatorial region
* Some equatorial regions receive radiation
  - solar radiation
* are humid and have heavy rainfall throughout the year.
* have few species than temperate regions
  - fewer species than temperate regions
* rotate faster than polar regions.

Geographic area
* Most geographic areas have heat accumulation.
* have accumulation

### location | region | geographical area:

Climatic zone
* approximate to distinct latitude belts around the Earth.
* geographical area
* shift with long-range weather patterns.

### location | region | geographical area | climatic zone:

Polar region
* Most polar regions get sunlight.
* Some polar regions get energy
  - have microscopes
* are bright, possibly due to a haze of small particles that lie above the main clouds.
* climatic zone
* experience a radiation deficit
  - climates
  - little chemical weathering
  - temperate climates
* have myofilaments and are contacted by efferent nerve fibers.
* play an essential role in the processes affecting the world's climate.
* receive less solar energy per unit area, and so less heat, than tropical regions do
  - more water as precipitation and river runoff than they lose via evaporation
* reflect the greatest changes in ozone concentrations, especially the South Pole.
* respond quickly to changes in climate conditions.

### location | region | geographical area | drainage area:

Detention basin
* control storm drainage by intercepting runoff and detaining it.
* drainage area

Drainage basin
* are crucial for resource management, ecosystems analysis, and global-change studies
  - important in ecology
  - separated by topographic highs called divides
* are the area of land that drain into rivers, streams, ponds, and estuaries
  - principal hydrologic unit considered in fluvial geomorphology