### motion | elevation:

Upland
* is the area above a waterways corridor.
* ridges and ridge complexes that lack natural fire breaks burn most frequently.

### motion | elevation:

Water level
* Some water levels depend on rainfall.
* are a function primarily of rain and, in the early spring, snowmelt
  - always high in summer, perhaps the result of glaciers receding in the mountains
  - at rock bottom
  - elevation
  - likely to rise with snow melt over the next several weeks
  - low in ponds and wells
  - normally lowest in autumn and highest in early spring
  - traditionally low during the cool season of the year
* can and do fluctuate dramatically.
* can change in a matter of hours
  - with the season or by the tides or even more quickly, due to rainfall
* can fluctuate and the current is strong
  - dramatically in rain-forest setting
  - rise very quickly during flash flood events
* drop in late summer exposing mud, attracting passage waders
  - rapidly when pumping starts and recover as rapidly when pumping stops
* fluctuate from day to day
  - greatly by season
  - slightly each year
* have waterfalls that bots hide behind and snipe from.
* impact hair quality.
* is elevation
  - influenced by events such as earthquakes and hurricanes
* makes a dramatic difference in the time it takes to travel from point to point.
* may have effects
  - term effects
  - undesirable effects
* measures one component of the energy in the waterway system.
* recover rapidly after each irrigation season.
* remain until waterfowl fledge their young in late spring.
* rise and fall according to the amount of rainfall in the area
  - in wet periods and decline in dry periods
  - rapidly during flash floods, often surprising victims
* rises again due to melting of ice caps.
* tend to be highest during winter.
* vary dramatically with the seasons
  - throughout the summer season
* vary with atmospheric conditions
  - rainfall and the depth of snowfall from the previous winter

### motion | elevation | water level:

Sea level
* Most sea levels have gravity
  - occur during years
* are water levels.
* begins to fall everywhere at the same time.
* drop as ocean water is used up to make ice
  - due to the removal of large volumes of water above sea level in the icecaps
* falls during ice ages because water is trapped in glaciers on the continents.
* is especially high in the western Pacific
  - likely to rise by two feet
  - mainly a function of amount of water tied up in ice caps
  - predicted to rise three feet during the next century
  - projected to rise due the thermal expansion of the oceans and the melting of glaciers
  - raised as the windswept wave progresses
* is the average height of the ocean
  - base level for rivers flowing into the sea
  - level of the ocean waters
  - lowest elevation in Texas and can be found in all coastal counties
* measure of the heat stored in the ocean.
* rise and fall many times
* rise as the polar ice caps melt
  - result of additional water produced from melted ice
  - with rivers and low lying wetlands overflowing
* useful indicator of processes in the equatorial Pacific.

### motion:

Eye movement
* are either spontaneous in nature or they are visually guided.
* cause a different amount of light to be reflected on the sensors.
* divide the visual perception of a scene into discrete episodes, or views.
* impaired by one or more vision conditions can result in visual scanning deficiencies.
* is motion
  - movement
* occur with blinking and result from the electrical charge of the eye itself.
* reflect impaired face processing in patients with schizophrenia.
* reveal the spatio-temporal dynamics of visual search.
* stop and brain waves become larger.
* tell a lot about vision, even if a child is pre-verbal.

### motion | eye movement:

Rotational nystagmus
* is eye movement
* occurs while the person is spinning.