Seasons on Earth

Seasons on Earth

Why do we have different seasons on earth?

Learning objectives

Recall that there is day and night because Earth spins on an axis.

Recall that Earth orbits the sun once a year.

To explain why days are longer in summer by discussing the angle of the earths tilt.

Multiple Choice

How long does it take earth to make one revolution around the sun?

• 12 hours
• 24 hours 
• 365 days
• 30 days

Multiple Choice

The earth orbits around the _________

• sun
• moon
• other planets
• solar system

Multiple Choice

How long is a day on earth?

• 22 hours

• 365 days

• 12 hours

• 24 hours

Multiple Choice

What causes more heat,  indirect sunlight or direct sunlight?

• indirect
• direct

Multiple Choice

The hemisphere where you live

• northern
• southern

Multiple Choice

Why is the Equator warmest?

• Because it is closest to the sun.
• Because it receives the most direct sunlight
• Because no clouds form here.
• Because it is far from the sun

The Earths axis and tilt

• Our Earth is tilted at 23.5^o along it's axis

• The earth is constantly rotating and we know it takes 24 hours to make a full rotation (night-day).

• This imaginary line (axis) runs through the centre of earth going from north to south pole.

Multiple Choice

What passes through the North and South pole?

• Sunlight
• Moonlight
• Water
• Earth's axis

Multiple Choice

Which of the following means to turn on an axis?

• relax
• rotate
• revolve 
• return

Multiple Choice

The Earth's axis is tilted _____ degrees.

• 23.5
• 25.3
• 30.2
• 24

What does this have to do with seasons?

• During the month of June the northern hemisphere (top half) of earth is pointed toward the sun.

• This causes an increase in termperature and amount of daily sunlight for countries here (this is their summer).

• (Meaning the southern hemisphere is experiencing the opposite - winter)

... continued

• During the month of December the southern hemisphere (bottom half) and south pole point towards the Sun.

• This causes an increase in termperature and amount of daily sunlight for countries here (this is their summer).

• (Meaning now the opposite for the northern hemisphere - winter)

Hemispheres and equator

• The equator runs horizontally through the centre of Earth.

• Anything above the equator line is known as the northern hemisphere (including the north pole)

• Anything below this line is known as the southern hemisphere (including the south pole)

Multiple Choice

In winter, the axis of the earth is pointed away or toward the sun?

• towards
• up
• down
• away

Multiple Choice

When it is day on one side of the Earth, what is it on the other side of the Earth?

• Summer
• Winter
• Night
• Day

Multiple Choice

What happens when the area in which you live tilts away from the sun?

• It is summer.
• It is spring.
• It is winter.
• It is fall.

Multiple Choice

At position A, which hemisphere would have summer?

• Northern hemisphere
• Southern hemisphere

Equinox

This is where there is an equal amount of day and night time (typically in March).

Multiple Choice

The term equinox means....

• equal amount of day light and equal amount of night
• Equal amount of winter and summer
• Equal amounts of hot dogs for everyone
• The longest day of the year