Exploring the Geologic Carbon Cycle

What is the main question the speaker is trying to address?

• How did Venus and Mars become different from Earth?

• Why is Earth the only habitable planet?

• All of the above

• What controls greenhouse gases in the atmosphere?

Where does the carbon dioxide in the atmosphere primarily come from?

• Photosynthesis

• Volcanism and metamorphic events

• Deforestation

• Burning of fossil fuels

What percentage of CO2 emissions do volcanoes contribute compared to human activities?

• 50%

• 10%

• 1%

• 25%

What is the most important process that removes CO2 from the atmosphere on Earth?

• Weathering of rocks

• Photosynthesis

• Ocean absorption

• Plant respiration

What is the result of carbon dioxide dissolving in water?

• Carbonic acid

• Nitric acid

• Hydrochloric acid

• Sulfuric acid

What is the net result of the weathering reaction involving carbon dioxide and anorthite?

• Formation of sodium chloride

• Release of methane

• Formation of calcium carbonate and clay minerals

• Formation of sulfuric acid

What is the common mineral found in granite that reacts with carbon dioxide?

• Quartz

• Mica

• Anorthite

• Feldspar

What is the composition of river water predominantly made up of?

• Magnesium sulfate

• Sodium chloride

• Bicarbonate ion and calcium

• Hydrogen ions and oxygen

Where does the final reaction of the three-part chemical process occur?

• In the atmosphere

• In the ocean

• In the forest

• In the soil

What do corals use to make their skeletons?

• Silica

• Calcium carbonate

• Magnesium

• Phosphate