Seasons Around The

Globe

SeasonsBecause the Earth’s axis is tilted, our planet is in different positions during the year. This is why we have four seasons.

Seasons around the world

Important Dates

Inclination of the Sun

Phases of the MoonPlease take out your notes and

add the following line:

The Moon always shows us the same side. This is because the Moon takes exactly the same amount of time to rotate as it

does to revolve around the Earth.

Polar Auroras

Pola

r Aur

oras

Aurora Australis above Kangarou Island, Australia

Aurora Borealis above Bear Lake, Alaska

Aurora Borealis above Bear Lake

Aurora From Outer Space

Red and Green Aurora from Outer Space

Polar Auroras

Polar auroras are caused by the solar wind. When the solar wind particles arrive near the Earth, they are diverted toward the poles. This is why auroras are usually observed in polar regions.

The arrival of the solar wind particles stimulates the particles in the Earth’s atmosphere. This is what triggers the spectacular light show of the polar auroras. It is usually observed as a green glow shimmering over the horizon.

Types of Polar Auroras

There are two types of polar auroras:• the aurora borealis appears in the

Northern Hemisphere• the aurora australis appears in the

Southern Hemisphere