Water Cycle EOG Review

What is the biggest and hottest object in our solar system?

• Earth

• Moon

• Sun

• Mars

Answer explanation

The Sun is the largest and hottest object in our solar system, providing light and heat to all planets, including Earth, Moon, and Mars. Its core temperature reaches about 15 million degrees Celsius, far exceeding any other solar system body.

What is the temperature of the sun's surface?

• 27,000,000°F

• 10,000°F

• 1,000,000°F

• 100,000°F

Answer explanation

The temperature of the sun's surface is approximately 10,000°F. This is significantly lower than the core temperature, which is around 27 million°F, making 10,000°F the correct choice for the surface temperature.

What would happen to life on Earth without the sun?

• Life would flourish

• There would be no life

• Life would remain unchanged

• Life would move to the moon

Answer explanation

Without the sun, Earth would lose its primary source of energy and heat, leading to extreme cold and darkness. This would make it impossible for life as we know it to survive, resulting in no life on Earth.

Where does most water for the water cycle start off?

• In the ocean, lakes, and rivers

• In the mountains

• In the desert

• In the forest

Answer explanation

Most water for the water cycle starts in the ocean, lakes, and rivers, as these bodies of water provide the primary source for evaporation, which is the first step in the cycle.

What is the process called when water turns into vapor due to heat?

• Freezing

• Condensation

• Evaporation

• Solidification

Answer explanation

The process when water turns into vapor due to heat is called evaporation. This occurs when water molecules gain enough energy to transition from a liquid state to a gaseous state.

What is the process called where plants release water vapor into the air?

• Evaporation

• Transpiration

• Condensation

• Precipitation

Answer explanation

The process where plants release water vapor into the air is called transpiration. This is distinct from evaporation, which refers to the conversion of liquid water to vapor from any surface.

Which of the following is a source of water vapor in the atmosphere?

• Oceans

• Plants

• Deserts

• Mountains

Answer explanation

Plants contribute to water vapor in the atmosphere through a process called transpiration, where they release moisture from their leaves. While oceans also release water vapor, the correct answer focuses on the role of plants.

Where does transpiration occur in plants?

• Roots

• Stems

• Leaves

• Flowers

Answer explanation

Transpiration primarily occurs in the leaves of plants, where stomata facilitate the release of water vapor into the atmosphere. This process helps in nutrient uptake and temperature regulation.

Which of the following is a result of transpiration?

• Water absorption from soil

• Water vapor release into the air

• Nutrient absorption from soil

• Oxygen release into the air

Answer explanation

Transpiration is the process where water is absorbed by plant roots and released as water vapor through stomata in leaves. Therefore, the correct result of transpiration is the release of water vapor into the air.

Which part of the plant is directly involved in transpiration?

• Roots

• Leaves

• Flowers

• Seeds

Answer explanation

Transpiration primarily occurs in the leaves of the plant, where water vapor is released through small openings called stomata. This process helps in nutrient transport and temperature regulation.