earth ans space science for a 7th graders final
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Define atmosphere.
The layer of gases surrounding Earth, essential for life.
True or false: The Earth’s core is primarily made of iron and nickel.
TRUE The outer core is liquid, while the inner core is solid.
Fill in the blank: Photosynthesis occurs in _______ of plants.
Chloroplasts
What is the water cycle?
The continuous movement of water through evaporation, condensation, and precipitation.
Define ecosystem.
A community of living organisms interacting with their environment.
What is gravity?
The force that attracts two bodies toward each other.
True or false: The moon has its own atmosphere.
FALSE The moon has a very thin exosphere, not a true atmosphere.
Fill in the blank: Tectonic plates float on the _______.
Asthenosphere
What is renewable energy?
Energy sourced from natural processes that are continuously replenished.
Define biome.
A large ecological area with distinct plant and animal groups.
What causes seasons on Earth?
The tilt of Earth’s axis as it orbits the sun.
True or false: Comets are made of ice and dust.
TRUE Comets develop tails when they approach the sun.
Fill in the blank: The Greenhouse Effect helps keep Earth _______.
Warm
What is climate change?
Long-term alteration of temperature and typical weather patterns.
Define fossil fuels.
Natural fuels formed from the remains of ancient organisms.
What is the hydrosphere?
All the water on Earth’s surface, including oceans and lakes.
True or false: Asteroids are larger than comets.
FALSE Asteroids are rocky, while comets are icy.
Fill in the blank: The stratosphere contains the _______.
Ozone layer
What is plate tectonics?
The theory explaining the movement of Earth’s plates.
Define biosphere.
The global sum of all ecosystems, where life exists.
What is pollution?
The introduction of harmful substances into the environment.
True or false: Earth is the third planet from the sun.
TRUE
Fill in the blank: Oceans cover about _______ of Earth’s surface.
71%
What is weathering?
The breaking down of rocks and minerals through natural processes.