CAEC Earth and Space Science 3

Question 1

What causes the seasons on Earth?

Accepted Answer

The tilt of Earth's axis as it orbits the Sun

Answer

Earth's 23.5° axial tilt changes the angle and duration of sunlight through the year.

Question 2

During which lunar phase can a solar eclipse occur?

Accepted Answer

New moon

Answer

A solar eclipse requires the Moon to be between Earth and the Sun, which happens at new moon.

Question 3

Why do coastal areas experience two high tides roughly every 24 hours and 50 minutes?

Accepted Answer

Earth rotates through two tidal bulges created mainly by the Moon's gravity

Answer

The Moon's gravity creates bulges on the near and far sides of Earth, and Earth rotates through both.

Question 4

Which statement best describes a light-year?

Accepted Answer

The distance light travels in one year

Answer

A light-year is a unit of distance, about 9.46 trillion kilometres.

Question 5

What is the main source of the Sun's energy?

Accepted Answer

Nuclear fusion of hydrogen into helium

Answer

In the Sun's core, hydrogen nuclei fuse into helium, releasing enormous energy.

(CAEC) Canadian Adult Education Credential Practice Test