Geography Questions

  

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Question: Please study the Isotherm map and information
below to fill in the box from A – H
One of the most important skills in reading maps is to be able to interpolate data
points. When reading an isoline map, you can find information about a point
based on its location on or near isolines. If a point is located directly on an
isoline that means that it has the same value as that isoline. If a data point is
between two isolines you can estimate it’s value based on how close it is to either
line (e.g., if it is closer to a 20 foot contour line than it is to the 30 foot contour
line, you can estimate the point’s elevation to be approximately 22 feet. If the
point was halfway between the lines you would choose 25 feet for it’s elevation.)
PLEASE READ AND STUDY THE MAP BELOW TO
FILL IN THE BELOW BOX
Many surfaces in nature are represented with isolines. They provide a way to represent 3Dimensional surfaces on a 2-Dimensional map. An isoline is simply a generic term for any
line on a map that connects points of equal value. Some examples of isolines are:
1.
2.
3.
4.
Isotherms – connects points of equal temperature
Isobars – connects points of equal air pressure
Isohyets – connects points of equal rainfall
Contours – connects points of equal elevation
Some basic rules regarding isoline maps are:
o
they connect points of equal value and never cross one another
o
o
o
o
o
o
they represent continuous surfaces (like a ground surface, i.e. it doesn’t
suddenly disappear)
isolines do not cross or touch (with the exception of vertical gradients, like
cliffs)
values on one side of the isoline are higher or lower than values on the other
side
the interval between isolines is the same over the entire map (unless otherwise
specified)
isoline maps of the environment almost always represent an overhead view,
looking straight down
in nature, there is usually a flow from the higher values toward the lower
values (for example, soil moving from high elevations to low elevations in
landslides, air moving from high pressure to low pressure, heat moving from
areas of high temperature to areas of low temperature)
Question: Determine the average January sea-level temperature at
the following lettered points. Indicate if your answers are in Celsius
or Fahrenheit.
…
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