1234

1. What force helps form a star?

• Interstellar

• Gravity

• Magnetic

• Nuclear

Answer explanation

Interstellar – This refers to space between stars, but it doesn't explain how stars form.

Magnetic – Magnetic fields can influence stars, but they don't form them.

Nuclear – This relates to the process inside a star (nuclear fusion), not how it's formed.

2. Why do we have seasons on Earth?

• The changing speed of Earth in its orbit

• The tilt of Earth’s rotation axis

• The distance of Earth from the Sun in winter due to its elliptical orbit

• The rotation of Earth

Answer explanation

The changing speed of Earth in its orbit – Incorrect. Earth's speed doesn't cause seasons.

The distance of Earth from the Sun in winter due to its elliptical orbit – Earth's orbit is elliptical, but distance doesn't cause seasons.

The rotation of Earth – This causes day and night, not seasons.

3. What makes Earth special compared to other planets?

• It is generally covered in water.

• It supports life.

• The atmosphere holds gases.

• All of the above contribute to Earth’s uniqueness.

Answer explanation

a. It is generally covered in water. – Earth has water, but this alone doesn't make it unique.

c. The atmosphere holds gases. – Many planets have atmospheres, so this isn't unique.

d. All of the above contribute to Earth’s uniqueness. – While these features are important, supporting life is the most defining.

4. Which statement is a fact?

• Four of the planets have rings.

• Mercury has an inferior average density than Uranus.

• The majority of the solar system’s mass is contained in the Sun.

• Saturn is the most massive planet in the solar system.

Answer explanation

a. Four of the planets have rings. – This is true; Jupiter, Saturn, Uranus, and Neptune have rings.

b. Mercury has an inferior average density than Uranus. – Incorrect. Mercury has a higher density than Uranus.

d. Saturn is the most massive planet in the solar system. – Incorrect. Jupiter is the most massive planet.

5. Why was the continental drift hypothesis not accepted at first?

• There was not enough evidence across continents

• Alfred Wegener couldn’t explain how continents moved

• Fossil records disproved the hypothesis

• Glacial evidence was found in hot equatorial regions

Answer explanation

a. There was not enough evidence across continents – Evidence was found, but it wasn’t enough to convince scientists at the time.

c. Fossil records disproved the hypothesis – Fossil records actually supported continental drift.

d. Glacial evidence was found in hot equatorial regions – This evidence supported continental drift, not disproved it.

6. Which layer of Earth creates its magnetic field?

• Inner Core

• Outer Core

• Crust

• Mantle

Answer explanation

a. Inner Core – Incorrect. The inner core is solid and doesn’t generate the magnetic field.

c. Crust – The crust is the solid outer layer and doesn’t produce the magnetic field.

d. Mantle – The mantle affects plate tectonics, not the magnetic field.

7. What are the main layers of the Earth?

• Core, mantle, and crust

• Crust, mantle, and core

• Inner core and outer core

• Lithosphere, crust, and mantle

8. How is the inner core different from the outer core?

• The inner core is solid, the outer core is liquid.

• The inner core is liquid, the outer core is solid.

• The inner core is liquid, the outer core is gas.

• The inner core is gas, the outer core is liquid.

9. A scientist finds a mineral that bubbles with acid. What is it?

• Calcite

• Mica

• Quartz

• Diamond

Answer explanation

b. Mica – Mica doesn’t react with acid.

c. Quartz – Quartz is resistant to acid and doesn’t bubble.

d. Diamond – Diamonds are made of carbon, but they don’t react with acid.

10. What happens during physical and chemical weathering?

• Physical Weathering breaks rocks into smaller pieces; chemical weathering changes their structure.

• Physical Weathering causes rocks to crumble; chemical weathering changes their structure.

• Both have the same process.

• All of the above