Our Changing Earth

Which of these is a product of weathering?

• rain

• lava

• small pieces of rock

• trees and other plants

Which of these is a chemical process?

• iron combining with oxygen

• rock breaking into pieces

What happens when water freezes?

• It expands

• It stays the same size

• It contracts or gets smaller

• It becomes a new substance

Which process is the picking up and moving of pieces of rock?

• erosion

• weathering

How does gravity affect objects on Earth?

• It pulls objects toward Earth

• It holds objects above Earth

Which particle size is biggest?

• clay

• sand

• gravel

• silt

Which feature is formed by moving water?

• a canyon

• a volcano

Which of these statements about an earthquake is true?

• It changes Earth's surface quickly

• It changes Earth's surface slowly

• It forms new rock and soil

How does wind change Earth's landforms?

• It causes new rocks to form

• It blows soil from place to place

• It knocks down trees

From what feature does a volcano's lava erupt?

• vent

• fault

• glacier

• plate