Question 1 of 10
As altitude increases within the lower atmosphere, air pressure generally:
Adoubles
Bdecreases
Cincreases
Dstays constant
Explanation
There is less air above you at higher altitudes, so air pressure decreases.
Question 2 of 10
Using the labeled contour lines on the map, what is the contour interval? 
A20 feet
B80 feet
C40 feet
D10 feet
Explanation
The contour interval is the elevation change between adjacent lines: 20 − 0 = 20.
Question 3 of 10
On a topographic map, contour lines that are spaced very close together indicate:
Aa steep slope
Ba body of water
Ca gentle slope
Dperfectly flat land
Explanation
Closely spaced contour lines mean elevation changes rapidly over a short distance — a steep slope.
Question 4 of 10
About how long does it take Earth to ROTATE once on its axis?
A24 hours
B365 days
Cabout one month
D12 hours
Explanation
One rotation of Earth on its axis takes about 24 hours, producing day and night.
Question 5 of 10
A barometer is an instrument used to measure:
Aair temperature
Bwind speed
Crelative humidity
Dair pressure
Explanation
A barometer measures atmospheric (air) pressure.
Question 6 of 10
As the temperature of air increases, the maximum amount of water vapor the air can hold:
Adrops to zero
Bstays the same
Cincreases
Ddecreases
Explanation
Warmer air can hold more water vapor before becoming saturated.
Question 7 of 10
The apparent daily motion of the Sun across the sky (rising in the east and setting in the west) is caused by:
AEarth's revolution around the Sun
Bthe Sun orbiting Earth
CEarth's rotation on its axis
Dthe gravitational pull of the Moon
Explanation
Earth rotates west-to-east on its axis, making the Sun appear to move east-to-west each day.
Question 8 of 10
The topographic map shows four locations labeled A, B, C, and D. At which location is the land surface STEEPEST? 
AD
BA
CB
DC
Explanation
Contour lines bunched close together show a steep slope (large elevation change over a short horizontal distance). They are closest at point A.
Question 9 of 10
Approximately how long does one complete revolution of Earth around the Sun take?
A365¼ days (one year)
B24 hours
C30 days
D27.3 days
Explanation
One revolution (orbit) of Earth around the Sun takes about 365¼ days — one year.
Question 10 of 10
The shape of the orbits of the planets around the Sun is best described as:
Aa straight line
Ban ellipse
Ca perfect circle
Da square
Explanation
Planetary orbits are ellipses (slightly elongated circles), with the Sun at one focus.