Question: Choose your answer.

What is the correct explanation for why we have day and night on Earth?
My Answer: Earth turns on its axis.

Question: Choose your answer.

Radio signal interruption sometimes causes a humming or buzzing sound. These sounds are most likely caused by
My Answer: electromagnetic waves.

Question: Choose your answer.

Which of these provides most of the oxygen in Earth's atmosphere?
My Answer: ocean phytoplankton

Question: Choose your answer.

The length of daylight changes as the seasons change during the year. What causes these changes in daylight?
My Answer:
Earth's tilt on its axis