Earth's Place in the Universe
This force keeps the planets in orbit around the sun.
Gravity
This system includes all the water on Earth, such as oceans, lakes, and rivers.
Hydrosphere
Cutting down large areas of trees for farming or buildings is called this.
Deforestation
This natural hazard occurs when the ground shakes due to movements in Earth's crust.
Earthquake
The different shapes of the Moon we see throughout the month are called this.
Moon Phases
The Sun, Moon, and stars appear to move across the sky because of this motion of Earth.
Rotation
Volcanoes, mountains, and valleys are part of this system, which includes Earth's landforms.
Geosphere
This is the gas produced by burning fossil fuels like coal and oil releases this gas, which contributes to climate change.
carbon dioxide (CO₂)
A swirling storm with strong winds and heavy rain that forms over warm ocean water.
Hurricane
The continuous movement of water through evaporation, condensation, and precipitation is called this.
The water cycle
It takes Earth approximately this long to complete one full orbit around the sun.
Plants, animals, and humans all belong to this Earth system.
Biosphere
Energy that comes from the Sun, wind, or water and doesn’t run out is called this.
Renewable Energy
A sudden flow of rocks, mud, and debris down a slope, often caused by heavy rain.
Landslide
The ocean’s tides are mainly caused by the gravitational pull of this celestial body.
Moon
The tilt of Earth's axis and its revolution around the sun cause this natural cycle.
Seasons
Rain, snow, and wind interact with Earth's surface in this system, which includes the air we breathe.
Atmosphere
When trash, chemicals, or other harmful materials enter the environment, it is called this.
Pollution
This natural hazard happens when magma, gas, and ash erupt from a mountain.
Volcanic Eruption
The process where rocks are broken down by wind, water, or ice over time is called this.
Weathering
This term describes the path that Earth follows as it moves around the Sun.
Orbit
Plants using sunlight and water to grow, scientists call this a(n)_____________.
Earth's system interaction
One way people can reduce waste and help the environment by reusing materials is called this.
Recycling
A giant ocean wave caused by an underwater earthquake or volcanic eruption.
Tsunami
This gas is the most abundant in Earth's atmosphere, making up about 78%.
nitrogen