Earth Science Regents Review
Unit 1
 _________________
 __________________
 Parallel
 Lines
lines
 Run east to west
 Measures distances north
or south
 Reference line is the
equator
 A.k.a. parallels
 0-90o
that meet at the
poles
 Run north to south
 Measures distances east
or west
 Reference line is the
prime meridian
 A.k.a. meridians
 0-180o
3) What is the North Star? How is it used
in navigation?
The altitude of Polaris is
equal to the latitude.
What is the international date
line?
It is the 180 degree line of longitude that separates
the eastern and western hemispheres.
Summary:
What is
the latitude for these locations?
Aim: How do we break down degrees into minutes?
Aim: How do we break down degrees into minutes?
1) How fast does the earth spin?

The earth does one
360 degree spin every
24 hours so:
360 degrees/ 24 hours=
15 degrees/hour
3) What is Greenwich Mean Time?

This is the
time on
the prime
meridian
where all
of the
world sets
its time
Why is California three hours behind us?
4) If you are west of the Prime
Meridian your time is ____________,
but if you are east then your time is
______________ because________
_______________________________
___________________________.
5) How do we find longitude using
difference in time?
Step 1: Find the
difference in time in
hours
 Step 2: Multiply by 15
 Step 3: Local time is
earlier=West
Local time is later=East


Contour map (same as topographic map)

Contour line

Gradient

Contour interval

Profile

The elevation increases inside of the line.

Subtract two contour index lines and divide by
the number of hops.


Connect
into a circle
Touch the
edge of the
map

Figure out the
value of the
next line then
subtract 1.

Look at the
lowest
adjacent line
then add 1.

Contour lines bend upstream. The river flows
opposite the point of the bend.

The closer the contour lines, the steeper the
gradient.


Higher elevations
The point of the “V” points up

They show
a hole or
depression

One point
can’t have
TWO
elevations.





Change in field value/Distance
If the land changed from a height of 50 m to a
height of 150 m over a distance of 25 km what
is the gradient?
150 m – 50 m/25 km
100 m / 25 km
4.0 m/km