### line | isopleth:

Isotherm
* appear in red and blue.
* are layers with the same temperature.
* are lines connecting points of equal temperature on a map
  - that connect places at the same temperature
  - part of weather maps
* bend toward the equator as they cross the continents in the winter hemisphere
  - pole as they cross the continents in the summer hemisphere
* is an isopleth
* sometimes deviate from a straight line for high concentrations.

Itinerary
* Itineraries are schedules.
+ Wikivoyage, Description, Itineraries: Travel :: Wikimedia Foundation :: Wikis
  * An itinerary describes a list of destinations and attractions to visit during a specific amount of time, with recommendations of how long to stay and routes to follow. Itineraries usually have a well-defined path.

Liaison
* are channels
  - links between words
* often make sure a child is fed and has warm clothes.

Lifeline
* are albums
  - lines
  - support
* breathes to allow moisture to evaporate from wet logs.

Line dancing
* form of dance done by an individual without a partner.
* is an American form of dancing, which can be done to almost any musical beat.

Line of latitude
* All lines of latitude are small with the exception of the equator.
* Lines of latitude are circles that run parallel to the equator
  - examples of planes that intersect the Earth sphere
  - imaginary lines that circle the earth parallel to the equator
  - parallel to the equator and circle the globe
  - the parallel lines north and south of the equator
  - go around the world parallel to the equator
  - run east and west, while lines of longitude run north and south

Line of sight
* Lines of sight is lines.
* is critical with wireless devices
  - the direct free-space path that exists between two points
* means that only visible surfaces are coated.

Long line
* are located in airports
  - movies
+ Drawing: Art
  * Drawing' is a way of making a picture. Drawings are created by making lines on a surface. Long lines make up the shapes and small lines make the textures. Drawings can be images of real life or abstract images showing ideas cannot be seen in the real world.

Molecular line
* are excellent diagnostics of the physical conditions in star-forming regions.
* constitute excellent diagnostics of the physical conditions of disks.

Parallel line
* are lines with no points in common
  - two imaginary lines that never cross but stay the same distance apart
* converge at eye level at a vanishing point.
* define the same point at infinity which , naturally, belongs to the line at infinity.
* do indeed stay parallel as they move through intergalactic space.
* have equal slopes.
* intercept congruent arcs on a circle.
* run in the same direction and are an equal distance apart at all points.

Perpendicular line
* are lines that intersect at right angles.
* cross at right angles.
* have negative reciprocal slopes
  - slopes which are negative reciprocals
* intersect in a special way, forming right angles.

Power cable
* Most power cables are part of grids.
* are also a safety hazard
  - essential in keeping computers and machinery up and running
* carrying direct current can cause deflection of the compass needle.
* consist of hard steel wire cores and highly conductive aluminum wires.
* emits high-voltage fields that interfere with data transmission.

Power line
* All power lines radiate electromagnetic fields.
* Most power lines are part of grids.
* Power Lines Stay safe by keeping well away from overhead power lines.
* are cables
  - electrical components
* can be at risk from currents induced by geomagnetic storms
  - introduce noise
* deliver alternating electric current to our homes.
* emit electromagnetic fields.
* lead to hair loss, loss of sexual potency, loss of weight, weight gain, etc.
* produce both electric and magnetic fields.