ASVAB General Science: Earth Science and Space Science — Questions and Answers
Question 1: Which layer of Earth's atmosphere contains the ozone layer and is where most weather patterns occur just below it?
- Troposphere
- Stratosphere (Correct answer)
- Mesosphere
- Thermosphere
Correct answer: Stratosphere
The ozone layer sits within the stratosphere (roughly 15–35 km altitude). Weather occurs in the troposphere below it, but the ozone layer itself is in the stratosphere.
Question 2: What is the correct order of the rock cycle stages when magma cools and eventually becomes sedimentary rock?
- Magma → igneous → weathering/erosion → sediment → sedimentary rock (Correct answer)
- Magma → sedimentary → metamorphic → igneous
- Magma → metamorphic → sediment → igneous
- Magma → sediment → igneous → sedimentary rock
Correct answer: Magma → igneous → weathering/erosion → sediment → sedimentary rock
Magma cools to form igneous rock. Weathering and erosion break igneous rock into sediment, which compacts and cements into sedimentary rock over time.
Question 3: Ocean tides are primarily caused by which force?
- Earth's rotation on its axis
- Solar wind pressure on the oceans
- The gravitational pull of the Moon (and to a lesser extent, the Sun) (Correct answer)
- Thermal expansion of ocean water
Correct answer: The gravitational pull of the Moon (and to a lesser extent, the Sun)
The Moon's gravity pulls ocean water toward it, creating a tidal bulge. The Sun also contributes, and when Sun, Earth, and Moon align (spring tides) the effect is strongest.
Question 4: On the Mohs hardness scale, which mineral is rated 10 (the hardest)?
- Quartz
- Corundum
- Diamond (Correct answer)
- Topaz
Correct answer: Diamond
Diamond is rated 10 on the Mohs scale, making it the hardest naturally occurring mineral. Corundum is 9, Topaz is 8, and Quartz is 7.
Question 5: Which planet in our solar system has the most moons?
- Jupiter
- Uranus
- Neptune
- Saturn (Correct answer)
Correct answer: Saturn
Saturn currently holds the record with over 140 confirmed moons, surpassing Jupiter. Both are gas giants with large moon systems, but Saturn's count is higher.
Question 6: What type of front forms when a cold air mass overtakes and pushes under a warm air mass, often causing thunderstorms?
- Stationary front
- Warm front
- Cold front (Correct answer)
- Occluded front
Correct answer: Cold front
A cold front occurs when a cold air mass advances and slides under a warmer air mass, forcing it upward rapidly. This rapid uplift causes thunderstorms and heavy precipitation.
ASVAB General Science: Earth Science and Space Science
Which layer of Earth's atmosphere contains the ozone layer and is where most weather patterns occur just below it?