Social Studies 3G

1
The way rocks are broken down into smaller bits
and soil is called

• weathering

2
Name 3 things that cause weathering (wearing
away) of the rock of the earths crust.

1. Wind
2. Water
3. Plants

3
How does wind cause weathering?

• Wind picks up sand and blows it against rocks,
  causing them to wear away.

4
How does water cause weathering?

• Water moving over rocks, wears them down or picks
  them up and bounces them around, causing them to
  break.
• Water also freezes, expands and cracks the rock
  into smaller pieces.

5
How do plants cause weathering?

• When plant roots grow into cracks in rocks, they
  split the rock.

6
Which rock looks weathered the most?

• The smoothest

7
The movement of soil or bits of rock by wind and
water is called

• erosion

8
The slow erosion to land is caused by.

1. Wind
2. Water
3. Glaciers
4. Gravity

9
How do water, ice, wind and gravity cause erosion.

• 1) Water washes away soil
• 2) Ice (glaciers) scrape up rocks and soil as
  they move downhill
• 3) Wind picks up small particles and moves them
  to a new spot
• 4) Gravity causes things to move downhill

10
How is a delta formed?

• Water moving downstream wears away rock into
  sediment, and deposits it at the end of the
  river.
• The sediment piles up into new land, called a
  delta.
• Deltas are often the shape of a triangle.

11
What are glaciers?

• Huge sheets of ice that form in places that are
  frozen all year round.
• Continental glaciers are much bigger than valley
  glaciers.

12
How do glaciers change the land?

• Gravity causes glaciers to move downhill about 1
  foot a day, and cut into the land along the way.
• They scrape up rocks and soil, and pile them up
  into hills.
• They scoop out large holes that sometimes fill
  with water which become lakes.
• They scoop out deep valleys

13
Name the layers of the Earth from inside, out.

1. Inner core
2. Outer core
3. Mantle
4. Crust

14
What is creep?

• Gravity causing the erosion of soil, by moving
  it slowly downhill.
• Creep causes roads to crack and fences to become
  crooked.