What is the independent variable?

• The variable that is measured.

• The variable that is changed.

• The variable that stays the same.

• The variable that is plotted on the y-axis.

During a science class, Kayla asked, 'Which of the following gas contributes to the greenhouse effect?

• O2

• N2

• CO2

• Ne

During a science class, Kennedy asked, 'What are fossil fuels primarily composed of?'

• Metals

• Carbon

• Water

• Minerals

During a science class, Kennedy asked, 'Which sphere of Earth includes all the water bodies?'

• Atmosphere

• Hydrosphere

• Geosphere

• Biosphere

During a science class, Christopher and Isabel were discussing different parts of the Earth. Which sphere of Earth includes the solid earth, such as rocks and soil?

• Atmosphere

• Hydrosphere

• Geosphere

• Biosphere

During a science class, Dan and Christopher observed that plants take in carbon dioxide during photosynthesis. Which of the spheres are interacting in this example?

• biosphere/hydrosphere

• atmosphere/geosphere

• geosphere/atmosphere

• biosphere/atmosphere

During a science class, Estfany asked, 'What is the source of energy for all food chains/food webs?'

• plants

• consumers

• producers

• the sun

What is the name of the model used to show to the amount of Earth's resources needed to support one person?

• Ecological Footprint

• Environmental Science

• Supply and Demand

• Developed Country

Which sphere contains all the gases around the earth?

• biosphere

• atmosphere

• hydrosphere

• geosphere (lithosphere)

For most of human history, people obtained food by collecting plants, hunting, or scavenging. These people are called ____.