What is soil primarily formed from?

• Melting rocks

• Weathering and erosion of rocks

• Condensation of water vapour

• Plant roots alone

The process by which rocks are broken down by freezing and thawing is called _____ weathering.

• physical

• chemical

• biological

• organic

Which of the following are types of rocks?

• Igneous

• Sedimentary

• Metamorphic

• Metallic

True or False: Sandy soil particles are the smallest among the three main soil types.

• True

• False

Which soil retains water and nutrients the best, making it ideal for agriculture?

• Sandy soil

• Clay soil

• Silt soil

• Gravelly soil

When plant roots grow into cracks and break rocks apart, it is an example of _____ weathering.

• physical

• chemical

• biological

• mechanical

Which agents can cause erosion? (select all correct answers)

• Wind

• Water

• Ice

• Gravity

Igneous rocks form from cooled lava or magma.

• True

• False

The supercontinent that existed about 250 million years ago was called ____.

• Gondwana

• Eurasia

• Pangaea

• Laurasia

Clay soil particles are very _____ and _____

• small, sticky

• large, rough

• smooth, dry

• big, loose