Carbon Cycle

When humans exhale, we release ________________.

• Oxygen

• Nitrogen

• Water

• Carbon Dioxide

Answer explanation

The process of respiration in humans involves inhaling oxygen and exhaling carbon dioxide. Other gases like nitrogen are not exhaled in significant amounts. While water is a byproduct of respiration, it's not the main gas released during exhalation. Therefore, when humans exhale, we primarily release carbon dioxide.

Tags

NGSS.MS-LS1-3

What is CO₂?

• Carbon Monoxide

• Carbon Dioxide

• Carbon Trioxide

• Oxygen

Answer explanation

CO2 stands for Carbon Dioxide. The question asked for the meaning of CO2. Among the provided options, Carbon Dioxide is the correct answer as CO2 is the scientific notation for Carbon Dioxide. Other options such as Carbon Monoxide, Carbon Trioxide, and Oxygen do not match.

Tags

NGSS.MS-PS1-1

Which of the following are fossil fuels?

• Coal, Water, Oil

• Oxygen, Coal, Oil

• Coal, Oil, Natural Gas

• None of these

Answer explanation

The question asks about fossil fuels. Fossil fuels are hydrocarbons, primarily coal, fuel oil or natural gas, formed from the remains of dead plants and animals. In context, the options provided were: Coal, Water, Oil; Oxygen, Coal, Oil; Coal, Oil, Natural Gas; and None of these. The correct option is Coal, Oil, Natural Gas, as these three are all types of fossil fuels.

Where can you find carbon?

• Only in the Earth's atmosphere.

• Inside all water molecules.

• Inside the sun.

• Inside every living thing on Earth.

Answer explanation

Carbon is a fundamental component of life and a vital part of many of our planet's natural processes. This element exists in almost all living things, making it abundantly found in all life forms on Earth. Although it is also found in the Earth's atmosphere and inside the sun, it's presence in every living thing makes this option the most accurate.

Carbon moves from fossil fuels to the atmosphere when the fuels are burned.

• True

• False

Answer explanation

The statement in the question is indeed true. When we burn fossil fuels like coal, oil, and gas, they release carbon dioxide into the atmosphere. This process is a significant contributor to the increasing levels of atmospheric carbon dioxide, and hence to global warming.

Tags

NGSS.MS-ESS2-1

What are fossil fuels made from?

• Plants and animals that are buried underground for millions of years.

• They absorb it from the atmosphere.

• Water

• Wind

Answer explanation

Fossil fuels are created from the remains of plants and animals that lived millions of years ago. These organisms were buried and subjected to high heat and pressure over time, transforming into the natural resources we use for energy today. The other options listed, such as absorption from the atmosphere or being made from water or wind, do not accurately describe the process of fossil fuel formation.

Tags

NGSS.MS-LS4-1

Plants use _______________________ to make their own food.

• Carbon Dioxide

• Oxygen

• Materials

• Gravity

Answer explanation

Plants use the process of photosynthesis to produce their own food. The fundamental inputs for this process include water, light, and Carbon Dioxide. They do not use Oxygen, Materials, or Gravity for food production. Therefore, the correct answer to the question is Carbon Dioxide.

Tags

NGSS.MS-LS2-3

NGSS.MS-LS1-6

Which of the following removes carbon dioxide from the atmosphere?

• Combustion

• Respiration

• Photosynthesis

• Death

Answer explanation

The question asks which process removes carbon dioxide from the atmosphere. The correct option is Photosynthesis. Photosynthesis is a process used by plants and other organisms to convert carbon dioxide into oxygen and glucose, thereby removing carbon dioxide from the atmosphere.

Tags

NGSS.MS-LS1-6

If the plant population decreased, the amount of carbon in the atmosphere would ______________.

• Increase

• Decrease

• Stay the same

Answer explanation

The correct answer is 'Increase'. This is because plants absorb carbon dioxide from the atmosphere for photosynthesis. When the plant population decreases, there are fewer plants to absorb carbon dioxide, leading to an increase in the amount of carbon in the atmosphere.

Tags

NGSS.MS-LS2-4

Why does too much carbon dioxide in the atmosphere cause climate change?

• It cools our planet.

• Blocks out UV rays.

• Lets light escape.

• Traps heat and warms the planet.

Answer explanation

The correct choice is that too much carbon dioxide in the atmosphere traps heat and warms the planet. This is because carbon dioxide is a greenhouse gas. When its levels are high, it absorbs more heat from the sun, preventing it from escaping. This accumulation of heat causes global warming, which is a significant aspect of climate change.

Tags

NGSS.HS-ESS2-6

NGSS.HS-ESS2-4