What causes the sky to appear blue instead of another color?

• The sun emits only blue light.

• Blue light scatters more in the atmosphere.

• The ocean reflects its color onto the sky.

• Clouds filter out all colors except blue.

What is the main reason fire feels hot?

• Fire is made of hot gases.

• Fire is alive and generates heat.

• Combustion releases energy as heat.

• Fire absorbs heat from the surroundings.

Which of the following is NOT needed for combustion to occur?

• Oxygen

• Heat

• Fuel

• Water

How did the solar system begin to form according to scientists?

• From a collision of two planets.

• From a giant cloud of dust and gas.

• From a black hole explosion.

• From a large asteroid impact.

What role does gravity play in the formation of planets?

• It pulls dust and gas together to form planets.

• It pushes planets away from the sun.

• It prevents planets from forming.

• It causes planets to spin faster.

During which stage of sleep do we experience the most vivid dreams?

• Awake state

• Light sleep

• Deep sleep

• REM sleep

What is one possible reason scientists believe we dream?

• To entertain us while we sleep.

• To make us feel tired.

• To help sort and store important memories.

• To keep our eyes moving.

Which animals are known to experience REM sleep?

• Reptiles and amphibians

• Only humans

• Only birds

• All mammals and some birds

What is one thing scientists are still unsure about regarding dreams?

• How long they last

• If animals dream

• Why we have them

• If they occur during REM sleep

What is encouraged at the end of the video?

• To stop asking questions

• To memorize all the facts

• To ignore curiosity

• To explore and find answers to epic questions