4th grade earth and rocks

Example

Which type of weathering is this: rocks heating by day and cooling at night?

1. Physical weathering breaks rock into pieces without changing what it is made of.
2. So the answer is: physical weathering

Answer: physical weathering

Example

At the bottom of a lake, mud builds up about 2 cm every 100 years. A layer of mud is 22 cm thick. About how many years did it take to form?

1. 22 ÷ 2 = 11
2. 11 × 100 = 1100
3. So the answer is: 1100

Answer: 1100

Example

Which process is this: tree roots growing into a rock?

1. Weathering breaks rock into smaller pieces where it is.
2. So the answer is: weathering (rock breaks down in place)

Answer: weathering (rock breaks down in place)

Example

On a world map, where are most earthquakes and volcanoes found?

1. Plate edges are where most earthquakes and volcanoes happen.
2. So the answer is: in long belts along the edges of Earth's plates

Answer: in long belts along the edges of Earth's plates

Example

On a map, 1 cm stands for 5 km. A volcano and a town are 6 cm apart on the map. How far apart are they in real life?

1. 6 × 5 = 30
2. So the answer is: 30 km

Answer: 30 km

Example

Which solution best reduces harm from earthquakes?

1. So the answer is: buildings with flexible frames and shock-absorbing bases

Answer: buildings with flexible frames and shock-absorbing bases