Habitable Zone

Flashcards covering the characteristics of planets, the habitable zone, atmospheric layers, the water cycle, and Earth's magnetic field as discussed in Week 4 of Earth and Space Science.

Mercury

The closest planet to the Sun and the smallest of them all.

Venus

The second planet from the Sun, known for its beautiful name.

Mars

A cold planet full of iron oxide dust, giving it a red appearance.

Habitable Zone

The region around a star where conditions could potentially sustain life, allowing for the presence of liquid water on a planet's surface; also called the Goldilocks Zone.

Atmosphere

Layers of gases surrounding a planet or other celestial body.

Nitrogen

The most abundant gas in Earth's atmosphere, making up $78\%$.

Oxygen

The gas that makes up $21\%$ of Earth's atmosphere.

Troposphere

The layer containing about $75\%$ of the atmosphere's air and almost all its water vapor, where clouds and weather occur.

Stratosphere

The layer where temperature increases with altitude due to the ozone layer and where commercial jet airplanes fly for stability.

Mesosphere

The coldest layer of the atmosphere where most meteors burn up due to friction with air particles.

Thermosphere

The layer containing the ionosphere and where colorful auroras (Northern and Southern Lights) occur.

Ionosphere

A region within the thermosphere filled with charged particles that help reflect radio waves for communication.

Exosphere

The outermost layer mainly containing hydrogen and helium, which gradually merges with outer space and houses artificial satellites.

Greenhouse Effect

The process through which the atmosphere regulates Earth's temperature.

Reservoir

A storage location for water such as an ocean, glacier, pond, or the atmosphere.

Ocean Water

The primary source of Earth's water, making up $97\%$ of the total distribution.

Fresh Water

Water that makes up only $3\%$ of Earth's total water distribution.

Hydrologic (water) cycle

The movement of water around Earth's surface through solid, liquid, and gas states.

Evaporation

The cycle process where water changes from a liquid to a gas to become water vapor.

Condensation

The process where water vapor remains in the atmosphere until it becomes tiny droplets of liquid.

Precipitation

The process where water droplets in the clouds collide, grow, and fall from the sky onto the land surface.

Sublimation

The process in which a solid changes directly into a gas without first becoming a liquid.

Transpiration

The process where plants take up water from the soil and release large amounts of water vapor through their leaves.

Magnetic Field

Also known as the geomagnetic field, it is generated in the planet's interior and extends into space.

Magnetosphere

The region created by the magnetic field that protects Earth by preventing solar wind from eroding the atmosphere.

Geologic Activity

A natural system maintaining conditions for life, including the generation of the magnetic field in the molten outer core and the support of ecosystems near hydrothermal vents.