The Earth

key notes :

Shape and Structure:

• Earth is shaped like a sphere, slightly flattened at the poles and bulging at the equator.
• It is called a geoid, meaning “Earth-like shape.”

Composition:

The Earth is made up of three main layers:

• Crust: The outermost layer, where we live.
• Mantle: A thick layer of semi-solid rock beneath the crust.
• Core: The innermost layer, divided into a solid inner core and a liquid outer core.

Earth’s Surface:

• About 71% of Earth’s surface is covered with water (oceans, seas, rivers, and lakes).
• The remaining 29% is land (continents, islands, mountains, plains, and valleys).

Earth’s Atmosphere:

• A layer of gases surrounding Earth, essential for life.
• Composed mainly of nitrogen (78%) and oxygen (21%), along with small amounts of other gases.

Earth’s Movements:

• Rotation: Earth spins on its axis, causing day and night.
• Revolution: Earth orbits around the Sun, causing seasons.

Earth’s Natural Features:

• Landforms like mountains, valleys, plateaus, and plains.
• Water bodies like oceans, rivers, and lakes.
• Forests, deserts, and grasslands contribute to Earth’s diversity.

Life on Earth:

• Earth is the only planet known to support life due to its atmosphere, water, and suitable temperature.

Protection of Earth:

• Reduce pollution and protect natural resources.
• Practice recycling, conserve energy, and protect wildlife.

Interesting Facts:

• Earth is the third planet from the Sun in our solar system.
• It takes 24 hours for Earth to complete one rotation and 365.25 days for one revolution around the Sun.

Let’s practice!