### surface feeders:

Northern pintail
* are surface feeders.
* eat the grains of wheat, barley, corn, rice, and oats.

### surface phenomenon:

Microbial growth
* clogs filters and shortens the interval until cleaning.
* is the reason water activity began to be used in the food industry.
* surface phenomenon.

### surface tension:

Capillarity
* Capillarities are surface tension.
* depends on both the cohesive and adhesive properties of the liquid.
* is one of the causes of the upward flow of water in the soil and in plants
  - the elevation or depression of liquids in small diameter tubes
* refers to a class of effects that depend on surface tension.

### surface tension:

Capillary action
* allows a paper towel or a sponge to be used to soak up spilled water.
* can be important when liquids infiltrate into porous materials.
* causes moisture to travel upward into the slab.
* depends on cohesion and adhesion.
* draws nutrient solution up through the growing medium
  - the water upward where it quickly evaporates, leaving a salty residue behind
* fills the channels with a polymer precursor.
* helps pull like molecules along by forces of adhesion.
* is also a result of surface tension
  - different because it depends upon the surface tension properties of water
  - the reason water in a saucer is sucked up into a flower pot
* occurs in very narrow tubes or channels.
* result of the surface tension of liquids.
* results from the porosity.
* takes place in dry climates.

Aileron
* are airfoils
  - mass balanced and aerodynamically counterbalanced
  - of metal structure, fabric-covered
  - part of wings
  - responsible for roll on most aircraft
  - small hinged sections on the outboard portion of a wing
* control an airplane's roll motion
  - the roll of an airplane
* operate in opposite directions on each side of the plane.

Black surface
* absorb heat, warming the soil for earlier production.
* are the best radiatiors of heat.

Brim
* Some brims are part of aquaria
  - baths
  - beakers
  - birdbaths
  - cauldrons
  - cisterns
* have a very small mouth.
* includes sections.
* is an edge

Ceiling
* Always hang the ceiling before the walls.
* are capable of leaks
  - metaphor
  - sags
* are located in buildings
  - chapels
  - classrooms
  - houses
  - lofts
* are part of hallways
  - upper surfaces
* are used for covers
  - paintings
* is an upper surface
* leak from time to time.

Celestial sphere
* Most celestial spheres have poles.
* Most celestial spheres make full rotation
* Some celestial spheres pass through celestial poles
  - show positions
* are immediately above the seventh sphere.

Cell surface
* Some cell surfaces pass through cell membranes
* are bumpy and are coated with a poro-elastic material, the glycocalyx.
* guide embryonic cells to form tissues and organs.

Charged surface
* can attract and hold contaminants, making removal from the environment difficult.
* repel and consequently the interaction between particles is affected.

Chessboard
* Consider a chess board with two of the diagonally opposite corners removed.
* are part of chess sets
* naturally increase players' focus on controlling the accentuated center of the board.

### surface:

Clipboard
* Most clipboards are made of masonite or particleboard , two types of wood
  - or particleboard, two types of wood.
  * are a little larger than a piece of paper. They are used to support paper with one hand, while writing on the paper with the other hand. Clipboards are often used in situations where a person may not be able to find a good writing surface.
  * can be made of many things. Most clipboards are made of masonite or particleboard, two types of wood. They can also be made from aluminum, steel, or acrylic, a type of plastic
* are located in classrooms
  - desks
  - schools
  - work
  - mechanical devices
* includes sections.