Reading Comprehension Test

Most diamonds were formed billions of years ago in an inner layer of the earth called the mantle. About 100 miles underground, the mantle puts extreme heat (1,800 degrees Fahrenheit) and pressure on carbon, the common black substance in coal and pencils. These forces turn black carbon into clear diamond crystal. As the crystal grows, it may trap other chemicals inside, creating what Harlow calls “a space capsule from the inner earth.”

A diamond is formed from

• carbon and heat.

• coal and heat.

• carbon, heat, and pressure.

• black crystals and chemicals.

Tags

CCSS.RI.6.2

CCSS.RI.7.2

CCSS.RI.8.2

CCSS.RL.6.2

CCSS.RL.7.2

Most diamonds were formed billions of years ago in an inner layer of the earth called the mantle. About 100 miles underground, the mantle puts extreme heat (1,800 degrees Fahrenheit) and pressure on carbon, the common black substance in coal and pencils. These forces turn black carbon into clear diamond crystal. As the crystal grows, it may trap other chemicals inside, creating what Harlow calls “a space capsule from the inner earth.”

The mantle

• was formed millions of years ago.

• created a lot of heat and pressure underground.

• is a layer of black carbon.

• was created by heat and pressure.

Tags

CCSS.RI.6.2

CCSS.RI.7.2

CCSS.RI.8.2

CCSS.RL.6.2

CCSS.RL.7.2

Most diamonds were formed billions of years ago in an inner layer of the earth called the mantle. About 100 miles underground, the mantle puts extreme heat (1,800 degrees Fahrenheit) and pressure on carbon, the common black substance in coal and pencils. These forces turn black carbon into clear diamond crystal. As the crystal grows, it may trap other chemicals inside, creating what Harlow calls “a space capsule from the inner earth.”

The earth’s mantle

• is 1,800 degrees Fahrenheit.

• is the place where coal is formed.

• is the layer of the earth in which diamonds are mined.

• traps chemicals to form crystals.

Tags

CCSS.RI.6.2

CCSS.RI.7.2

CCSS.RL.6.2

CCSS.RL.7.2

CCSS.RL.8.2

Most diamonds were formed billions of years ago in an inner layer of the earth called the mantle. About 100 miles underground, the mantle puts extreme heat (1,800 degrees Fahrenheit) and pressure on carbon, the common black substance in coal and pencils. These forces turn black carbon into clear diamond crystal. As the crystal grows, it may trap other chemicals inside, creating what Harlow calls “a space capsule from the inner earth.”

What is the basic element that forms a diamond?

• carbon

• coal

• chemicals

• crystals

Tags

CCSS.RI.6.2

CCSS.RI.7.2

CCSS.RI.8.2

CCSS.RL.6.2

CCSS.RL.7.2

Most diamonds were formed billions of years ago in an inner layer of the earth called the mantle. About 100 miles underground, the mantle puts extreme heat (1,800 degrees Fahrenheit) and pressure on carbon, the common black substance in coal and pencils. These forces turn black carbon into clear diamond crystal. As the crystal grows, it may trap other chemicals inside, creating what Harlow calls “a space capsule from the inner earth.”

Clear diamond crystals

• were formed millions or even billions of years ago.

• are used in pencils.

• are formed 1,800 miles under the earth’s surface.

• are used to make space capsules.

Tags

CCSS.RI.7.2

CCSS.RI.8.2

CCSS.RL.6.2

CCSS.RL.7.2

CCSS.RL.8.2