Space Systems
History of Earth
Earth's Systems
Weather and Climate
Human Sustainability
100

This process creates stars, powers the Sun and provides energy for life on Earth.

What is nuclear fusion?

100

This theory is supported by fossil evidence and seafloor spreading.

What is plate tectonics?

100

This type of loop amplifies change in a system.

What is a positive feedback loop?

100

These air systems cause weather changes at their boundaries.

What are air masses?

100

This analysis compares benefits and drawbacks of a solution.

What is a cost-benefit analysis?

200

This theory explains the origin and expansion of the universe.

Big Bang Theory

200

These are used to date rock layers because they existed for a short period of time and are widespread

What are index fossils?

200

This cycle transforms rocks over time from sedimentary to metamorphic to igneous and back around again

What is the rock cycle?

200

This causes the Earth’s seasonal changes.

What is the tilt of Earth's axis?

200

Burning these fuels adds CO₂ to the atmosphere.

What are fossil fuels?

300

This process forms elements heavier than helium in stars

What is stellar nucleosynthesis

300

These layers record geological and environmental history.

What are sedimentary layers?

300

Mantle convection drives this geological process.

What is plate tectonics?

300

Warm air rising over cool air creates this type of front.

What is a warm front?

300

This practice helps preserve species diversity.

What is biodiversity conservation?

400

The tilt of Earth’s axis causes this yearly cycle.

What are the seasons?

400

Mountains form through plate collisions and this vertical movement.

What is uplift?

400

This process breaks down rock physically and chemically.

What is weathering?

400

The reflectivity of Earth's surface is known as this.

What is albedo?

400

Examples include solar and wind energy.

What are renewable energy sources?

500

Long-term climate changes are influenced by these orbital variations.

Milankovitch cycles?

500

Magnetic stripes on the seafloor confirm this tectonic process.

What is seafloor spreading?

500

This gas is cycled between the atmosphere, oceans, and organisms.

  • What is carbon dioxide?

500

This refers to long-term patterns of temperature and precipitation.

What is climate?

500

This is the human-caused warming of Earth’s climate.

What is climate change?

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