The Earth is the third planet from the The Earth is the third planet from the SunSun. .

Its shape is spherical but flattened at the Its shape is spherical but flattened at the polespoles: North Pole at the top and South Pole : North Pole at the top and South Pole at the bottom.at the bottom.

It is the only planetIt is the only planet

that that nowadays nowadays hashas

life on it.life on it.

Most of the Earth is formed by Most of the Earth is formed by water, salt water.water, salt water.

EARTH’S MOVEMENTSEARTH’S MOVEMENTSThe Earth has got two movementsThe Earth has got two movements::

ROTATIONROTATION REVOLUTION

The Earth rotates on its axis. This movement is called the Earth’s Rotation.

axis

The Earth takes The Earth takes a day a day to rotateto rotate

A day is 24 hoursA day is 24 hours

THE EARTH’S ROTATIONTHE EARTH’S ROTATION The Earth's Rotation causes The Earth's Rotation causes dayday and and nightnight::

It is day whenIt is day when

our part of the Earthour part of the Earth

is illuminated is illuminated

by the Sun.by the Sun.

It is night when It is night when

our part of the Earthour part of the Earth

is not illuminated is not illuminated

by the Sun.by the Sun.

The Earth orbits the Sun. The Earth orbits the Sun. This movement is called the This movement is called the Earth's Earth's

Revolution.Revolution.

The form of The form of the Earth’s orbit is the Earth’s orbit is ellipticalelliptical

Earth’s orbit

Circular orbit

Elliptical orbit

The Earth takes The Earth takes a year to orbit the Suna year to orbit the Sun

A year is A year is 365 days365 days A year is divided in A year is divided in 12 months12 months

The Earth’s Revolution causes The Earth’s Revolution causes the seasonsthe seasons

The seasons are caused by the The seasons are caused by the inclination of the Earth’s axis.inclination of the Earth’s axis.

The inclination of the Earth’s axis during The inclination of the Earth’s axis during the Earth’s orbit around the Sun:the Earth’s orbit around the Sun:

One hemisphereOne hemisphereof the Earth receivesof the Earth receivesless heat and lightless heat and lightthan the other. than the other.

It’s It’s winter

The other hemisphereThe other hemispherereceives receives more lightmore lightand heat.and heat.

It’s It’s summersummer

It is hotter than in the rest of the year.It is hotter than in the rest of the year. Days are longer and night are shorterDays are longer and night are shorter

It is colder.It is colder. Days are shorter and nights are longerDays are shorter and nights are longer

Spring is the season between winter and summer. Spring is the season between winter and summer. Autumn is the season betwwen summer and Autumn is the season betwwen summer and

winter.winter. In spring and autumn temperatures are moderate.In spring and autumn temperatures are moderate. Days and nights are almost the same lengthDays and nights are almost the same length