NEW SCIENCE Flashcards for Section 4: Earth's Atmosphere and Human Impact (SUMMER EXAM)
1
Q
What are the percentages of oxygen and nitrogen in the atmosphere?
A
About 80% nitrogen and 20% oxygen.
2
Q
What is the chemical formula for carbon dioxide?
A
CO₂
3
Q
What is a carbon sink?
A
Natural systems that absorb and store carbon, like forests and oceans.
4
Q
Q4: What is the greenhouse effect?
A
Sunlight hits the Earth. Some of it is absorbed and some is reflected. The absorbed heat is later emitted back into the atmosphere, where it is trapped by greenhouse gases, increasing the temperature.
5
Q
Name three greenhouse gases.
A
Water vapor, carbon dioxide, methane.
6
Q
What is one effect of global warming?
A
Ice caps melting, rising sea levels, extreme weather, loss of habitats.
