What is the primary reason for Earth's changing seasons?

• The Earth's distance from the Sun

• The Earth's axial tilt

• The Earth's elliptical orbit

• The Earth's rotation speed

When is the Earth closest to the Sun?

• During the Northern Hemisphere's summer

• During the Northern Hemisphere's winter

• During the Southern Hemisphere's summer

• During the Southern Hemisphere's winter

What occurs during the summer solstice in the Northern Hemisphere?

• The shortest day of the year

• The longest day of the year

• Equal day and night length

• The Sun is directly over the equator

What marks the beginning of spring in the Northern Hemisphere?

• The summer solstice

• The winter solstice

• The spring equinox

• The autumnal equinox

Why do polar regions experience long periods of daylight in summer and darkness in winter?

• Due to the Earth's distance from the Sun

• Because of the Earth's axial tilt

• Because of the Earth's rotation speed

• Due to the Earth's elliptical orbit

How does the tilt of Earth’s axis cause the seasons to change throughout the year?

Why do you think the Northern and Southern Hemispheres experience opposite seasons at the same time?

What might happen to our seasons if Earth’s axis were not tilted at all?

Describe how Earth’s revolution around the Sun affects the amount of daylight we experience during different seasons.

The model shows Earth in four different positions in its orbit around the Sun. Which statement correctly explains which position of Earth represents summer in the United States?