Spherical Earth

Gravity

Gravity's Role in Earth's Shape

The force of gravity acts like a mold, shaping the surface of the Earth into a spherical shape. Images of the Earth taken from space clearly show its roundness. Gravity pulls objects toward the center of the Earth, creating a curved surface known as the horizon.

Multiple Choice

What force shapes the surface of the Earth into a spherical shape?

• Magnetism

• Friction

• Gravity

• Buoyancy

Force that Shapes Earth

Buoyancy is the force that shapes the surface of the Earth into a spherical shape. It is the upward force exerted by a fluid that opposes the weight of an immersed object. Without buoyancy, the Earth's surface would not be able to maintain its shape and would be flat instead of round. This force is crucial in shaping our planet as we know it today.

Evidence of a Spherical Earth

During a lunar eclipse, Earth's shadow falls on the Moon, creating a curved shape. This proves that the Earth is round. The shape of the shadow provides evidence of the Earth's spherical shape.

Multiple Choice

What does a lunar eclipse prove about the Earth?

• The Earth is flat

• The Earth is square

• The Earth is round

• The Earth is triangular

Earth's Shape:

A lunar eclipse proves that the Earth is round. During a lunar eclipse, the Earth casts a round shadow on the Moon. This phenomenon can only occur if the Earth is a sphere. It is a compelling evidence that supports the widely accepted belief that the Earth is not flat or any other shape.

Discovery of Gravity

• Sir Isaac Newton discovered gravity
• He observed an apple falling to the ground
• He named the force that pulls objects towards the center of the Earth as gravity

Multiple Choice

What did Sir Isaac Newton discover?

• Electricity

• Magnetism

• Gravity

• Light

Sir Isaac Newton

Trivia: Sir Isaac Newton discovered light, which is a form of electromagnetic radiation that allows us to see the world around us. His experiments with prisms showed that white light is actually made up of a spectrum of colors. This discovery revolutionized our understanding of optics and laid the foundation for modern physics.

The Mystery of Disappearing Ships

When a ship passes the horizon, it appears to disappear because the Earth is spherical. The force of gravity pulls all objects, including the mass of the Earth, toward Earth's center, causing the Earth to have a curved surface. Gravity was discovered by Sir Isaac Newton after observing an apple falling from a tree.

Multiple Choice

Why does a ship appear to disappear when it passes the horizon?

• Because the Earth is flat

• Because the ship sinks

• Because the ship becomes invisible

• Because the Earth is spherical

Ship Disappearing

Trivia: When a ship passes the horizon, it appears to disappear because of the Earth's spherical shape. As the ship moves away, its bottom becomes hidden by the curvature of the Earth. This phenomenon is known as the horizon effect. The ship is still there, just out of sight!

​Blooket