Slow Earth Changes

Weathering happens when a rock's shape is formed. This can take:

• 2 minutes

• 6 months

• 20 seconds

• thousands of years

Why does this water look "dirty"?

• People made it dirty.

• It comes from a dirty place.

• Tiny rocks are being carried away with the water.

What do you think helped change the shape of this rock?

• Ms. Michelle

• a flood

• wind

• a tsunami

The process that breaks down rocks and other materials on Earth's surface is called

• Weathering
• Erosion
• Deposition
• Decomposition

What is the process that picks up and moves weathered rocks?

• Deposition
• Landslide
• Weathering
• Erosion

Deposition changes the Earth’s surface because bits of broken rock and soil _____.

• stop rivers from flowing.
• make rich farmlands.
• are dropped in new places.
• move very slowly.

How does freezing water cause the weathering of rocks? The freezing water—

• keeps the rocks in place.

• makes the rocks last longer.

• expands cracks and breaks rocks.

• causes rocks to fall in landslides.

What causes the greatest erosion effect on our beaches?

• Waves

• Gravity

• Glaciers

• Wind

How do plants weather rocks?

• During photosynthesis

• When roots grow into cracks of rocks and expand the rock breaks.

• When the plant moves water from the roots to the leaves, the rock breaks.

• Plants don't weather rocks.

What is the wearing away or breaking down of rocks called?

• Deposition

• Erosion

• Glaciers

• Weathering