Question

Choose the statements that accurately describe Earth's magnetic field:

1. It is primarily generated by the solid inner core.
2. The magnetic field protects Earth from solar radiation.
3. Earth's magnetic field is static and does not change over time

• A. None of these
• B. i, ii
• C. i only
• D. All

Answer 1

Answer:

B. i, ii

 Earth's magnetic field

• Earth's magnetic field, also known as the geomagnetic field, is the magnetic field that extends from Earth's interior out into space.
• The Earth's magnetic field is primarily generated by the movement of molten iron and nickel in the outer core.
• This movement, driven by heat and convection, creates a geodynamo effect that generates the magnetic field.
• Earth's magnetic field plays a crucial role in protecting the planet from harmful solar radiation and charged particles from the Sun.
• It acts as a shield, deflecting these particles away from the Earth's surface and preventing them from causing harm to the atmosphere and living organisms.
• Earth's magnetic field is not static; it changes over time.
• This phenomenon is known as geomagnetic variation or secular variation.
• The Earth's magnetic field can undergo gradual changes and even experience reversals where the magnetic north and south poles switch places over geological timescales.