Here are the correct answers for the 7th Grade Science Vocabulary Quiz, based on the definitions provided in each question.
1. Mesosphere
The mesosphere is the layer of the atmosphere above the stratosphere. It is the coldest layer of the atmosphere, and it is where most meteors burn up upon entering Earth's atmosphere.
2. Greenhouse gases
Greenhouse gases (like carbon dioxide and methane) trap heat in the atmosphere. They absorb infrared radiation emitted by the Earth's surface and re-radiate it, contributing to the greenhouse effect.
3. Humidity
Humidity is a measure of the amount of water vapor present in the air.
4. Air pressure
Air pressure is defined as the force exerted by the weight of air molecules pushing down on a specific area.
5. Atom
An atom is the basic building block of all matter. It is the smallest unit of an element that retains the chemical properties of that element.
6. Stratosphere
The stratosphere is the second major layer of Earth's atmosphere. It is known for being dry and containing the ozone layer, which absorbs much of the Sun's ultraviolet radiation.
7. Conduction
Conduction is the process by which heat energy is transferred between substances that are in direct contact with each other (like a spoon getting hot in a cup of soup).
8. Oxygen
Oxygen is a gas that makes up approximately 21% of Earth's atmosphere. It is essential for respiration in most living organisms.
9. Nitrogen
Nitrogen is the most abundant gas in Earth's atmosphere, making up about 78% of the air we breathe.
10. Ozone
Ozone ($O_3$) is a molecule made up of three oxygen atoms. It forms a protective layer in the stratosphere.
11. Hurricane
A hurricane is a powerful tropical storm system characterized by low pressure at its center and sustained winds of 74 miles per hour (mph) or higher.
12. Thermosphere
The thermosphere is the layer of the atmosphere above the mesosphere. Although temperatures here can get very high due to solar radiation, the air is so thin (few molecules) that it would feel cold to a human because there isn't enough matter to transfer heat to the skin.
13. Radiation
Radiation is the transfer of energy through space via electromagnetic waves (such as light or heat from the sun), requiring no medium (matter) to travel through.
14. Air mass
An air mass is a large body of air that has similar temperature and humidity characteristics throughout because it formed over a uniform surface (like an ocean or a desert).
15. Convection
Convection is the transfer of heat through the movement of fluids (liquids or gases). Hot fluid rises because it is less dense, and cooler fluid sinks, creating a circulation pattern.
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Final Answer:
1. B
2. C
3. A
4. B
5. B
6. D
7. B
8. D
9. A
10. D
11. C
12. D
13. C
14. B
15. D
Parent Tip: Review the logic above to help your child master the concept of 7th grade science questions.
