The Physical World Vocabulary

What is weathering?

• The movement of sediment from one location to another
• The breaking down of rocks in place
• The formation of new rocks
• The process of soil formation

Where is most of Earth's groundwater stored?

• In streams, rivers, and lakes
• In aquifers and porous rock layers
• In glaciers and ice caps
• In the atmosphere

How long does it take for Earth to complete one rotation around the sun?

• 365 days exactly
• \(365\frac{1}{4}\) days
• 366 days
• 364 days

How are streams formed?

• By tectonic plate movements
• Through volcanic activity
• When precipitation collects in narrow channels
• By the melting of glaciers

What is the primary cause of erosion?

• Earthquakes
• Wind and water movement
• Plant growth
• Animal migration

What affects the amount of sunlight Earth receives?

• The planet's tilt
• The amount of erosion
• The speed of Earth's rotation
• The number of mountains on Earth

What is humus?

• A type of rock formation
• Decayed plant or animal matter in soil
• A layer of the atmosphere
• A type of weather pattern

What are conditions or changes in the air in a certain time and place called?

• Climate
• Weather
• Atmosphere
• Biosphere

What is reforestation?

• The natural growth of forests
• Cutting down trees for lumber
• Planting trees where forests once stood
• The process of forest fires regenerating an ecosystem

When is a species considered extinct?

• When it's endangered
• When it has completely died out
• When it's only found in zoos
• When its habitat is destroyed