Earth's Magnetic Field Concepts

Earth's Magnetic Field Concepts

Assessment

Interactive Video

Science, Geography, Physics

6th - 7th Grade

Hard

Created by

Patricia Brown

FREE Resource

The video explores Earth's magnetic field, its protective role, and the phenomenon of magnetic field reversal. It explains that the magnetic field has reversed multiple times in Earth's history, with the last reversal occurring 780,000 years ago. Current research indicates the field is weakening, suggesting a potential future reversal. The video reassures viewers that such reversals do not cause mass extinctions but may affect technology and animal navigation. The dynamo effect, involving molten iron in Earth's outer core, is responsible for generating the magnetic field, though the exact cause of reversals remains unknown. The video concludes by encouraging further exploration of related topics.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is one of the primary functions of Earth's magnetic field?

To support plant growth

To provide gravity

To protect against space radiation

To regulate climate

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How can Earth's magnetic field be visualized?

As a spinning top

As a giant bar magnet

As a flat disk

As a pyramid

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Approximately how often has Earth's magnetic field reversed in the past 20 million years?

Every 200,000 to 300,000 years

Every 500,000 years

Every 100,000 years

Every 50,000 years

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What recent discovery has been made about Earth's magnetic field?

It has stopped reversing

It is moving towards the equator

It is weakening at a faster rate than previously thought

It is strengthening rapidly

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a potential risk of a weakening magnetic field?

Global warming

Increased earthquakes

Disruption of power grids and communication systems

Increased volcanic activity

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which animals might be affected by changes in the magnetic field?

Dolphins

Elephants

Pigeons

Lions

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What generates Earth's magnetic field?

The rotation of the Earth

The motion of molten iron in the outer core

The gravitational pull of the moon

The Earth's atmosphere

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