Lesson 2
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What is the name of the thin layer of the earth that we live on?
The atmosphere The atmosphere is a layer of gases surrounding the Earth’s crust.
What is the primary gas that makes up about 78% of the Earth’s atmosphere?
Nitrogen Nitrogen is essential in amino acids and proteins but is unreactive.
What percentage of the atmosphere is made up of oxygen?
21% Oxygen is essential for aerobic respiration and generated through photosynthesis.
What is the role of carbon dioxide in the Earth’s atmosphere?
Regulating temperature Carbon dioxide, though only 0.04% of the atmosphere, plays a crucial role in temperature regulation.
What is gas A, which makes up most of the atmosphere?
Nitrogen Nitrogen is the most abundant gas in the atmosphere.
What is the molecular formula for oxygen?
O2 Oxygen exists as a diatomic molecule.
What is gas C, which makes up around 1% of the Earth’s atmosphere?
Argon Argon is a noble gas and is unreactive.
Which gas do humans inhale but is not used in the respiration process?
Nitrogen Nitrogen is inhaled but not utilized in metabolic processes.
What two gases make up about 99% of the Earth’s atmosphere?
Nitrogen and Oxygen Together, these gases dominate the atmospheric composition.
Fill in the blank: The atmosphere was formed around ______ billion years ago.
4.6 This marks the beginning of Earth’s atmospheric history.
What biological process is the source of oxygen in the atmosphere?
Photosynthesis Photosynthesis is the process by which plants generate oxygen.
True or False: Argon has changed in amount since the Earth was first formed.
False Argon levels have remained constant since the Earth’s formation.
What is the chemical formula for carbon dioxide?
CO2 Carbon dioxide consists of one carbon atom and two oxygen atoms.
What percentage of the atmosphere is made up of carbon dioxide?
0.04% Despite its low percentage, carbon dioxide significantly affects the climate.
What is the state change from a solid to a liquid called?
Melting This process occurs when a solid is heated to its melting point.
How does the temperature change as you move towards the center of the Earth?
It increases Temperature rises due to geothermal gradients within the Earth’s layers.