Question

Q. With reference to the core of the earth, which of the following statements is incorrect?

• A. The core makes up more than 40% of Earth by volume.
• B. The inner core is in a solid state while the outer core is in a liquid state.
• C. There are no samples of Earth's core accessible for direct measurement.
• D. The major contributors to heat in the core are radioactive decay and leftover heat from the planetary formation.

Answer 1

The correct option is A The core makes up more than 40% of Earth by volume.

Explanation:

Except for the first statement, all others are correct.

Although the core and the mantle are about equal in thickness, the core actually makes up only about 15 percent of the Earth's volume, on the other hand, the mantle occupies about 84 percent. The Earth’s crust makes up the remaining 1 percent. Earth’s core is the extremely hot, dense center of the planet. The ball-shaped core lies beneath the cool, brittle crust and the mostly-solid mantle. The core is found at about 2,900 kilometers (1,802 miles) below Earth’s surface and possesses a radius of about 3,485 kilometers (2,165 miles).