Question 1 of 10
Using the labeled contour lines on the map, what is the contour interval? 
A 20 feet
B 40 feet
C 10 feet
D 80 feet
Explanation
The contour interval is the elevation change between adjacent lines: 20 − 0 = 20.
Question 2 of 10
Approximately how long does one complete revolution of Earth around the Sun take?
A 30 days
B 27.3 days
C 365¼ days (one year)
D 24 hours
Explanation
One revolution (orbit) of Earth around the Sun takes about 365¼ days — one year.
Question 3 of 10
About how long does it take Earth to ROTATE once on its axis?
A 24 hours
B 12 hours
C about one month
D 365 days
Explanation
One rotation of Earth on its axis takes about 24 hours, producing day and night.
Question 4 of 10
As the temperature of air increases, the maximum amount of water vapor the air can hold:
A decreases
B increases
C stays the same
D drops to zero
Explanation
Warmer air can hold more water vapor before becoming saturated.
Question 5 of 10
The apparent daily motion of the Sun across the sky (rising in the east and setting in the west) is caused by:
A Earth's rotation on its axis
B the gravitational pull of the Moon
C Earth's revolution around the Sun
D the Sun orbiting Earth
Explanation
Earth rotates west-to-east on its axis, making the Sun appear to move east-to-west each day.
Question 6 of 10
A barometer is an instrument used to measure:
A air temperature
B air pressure
C wind speed
D relative humidity
Explanation
A barometer measures atmospheric (air) pressure.
Question 7 of 10
The shape of the orbits of the planets around the Sun is best described as:
A an ellipse
B a square
C a straight line
D a perfect circle
Explanation
Planetary orbits are ellipses (slightly elongated circles), with the Sun at one focus.
Question 8 of 10
On a topographic map, contour lines that are spaced very close together indicate:
A a body of water
B perfectly flat land
C a gentle slope
D a steep slope
Explanation
Closely spaced contour lines mean elevation changes rapidly over a short distance — a steep slope.
Question 9 of 10
As altitude increases within the lower atmosphere, air pressure generally:
A stays constant
B doubles
C decreases
D increases
Explanation
There is less air above you at higher altitudes, so air pressure decreases.
Question 10 of 10
The topographic map shows four locations labeled A, B, C, and D. At which location is the land surface STEEPEST? 
A D
B B
C A
D C
Explanation
Contour lines bunched close together show a steep slope (large elevation change over a short horizontal distance). They are closest at point A.