Water seeps into a tiny crack in a rock. The water freezes and expands, pushing against the sides of the crack. The rock breaks apart. What is this an example of?

• abrasion

• decay

• erosion

• weathering

Tags

NGSS.MS-ESS2-2

Which of the following is an example of erosion?

• Chemicals in water weaken rock causing it to break into pieces.

• A river carries bits of rock and soil away from the riverbanks to the ocean.

• A plant's roots grow into the tiny cracks in a rock, causing it to break apart.

• Ice in a crack in a rock thaws and seeps deeper into the rock. When the water freezes, it expands and widens the crack.

Tags

NGSS.MS-ESS2-2

During the 1930s, farmers plowed up prairie grasses on the Great Plains. The soil dried out. Later, wind blew the soil away because the grass was not there to hold it.

What do scientists call the process of the wind carrying the soil away?

• decay

• erosion

• tornado

• weathering

Natural processes affect rocks and soil. The land is always changing.

What is the main difference between weathering and erosion?

• Weathering can involve ice, but erosion does not.

• Weathering involves weather, but erosion does not.

• Weathering only involves wind, while erosion only involves water.

• Weathering happens in one place, while erosion involves the movement of material.

Tags

NGSS.MS-ESS2-4

Which of these best describes the result from weathering by a fast-moving river?

• smooth, rounded rocks

• rocks with jagged edges

• sand moved further downstream

• large rocks carried from different places

Mr. Li told his science class that the slate table-tops in the classroom were made from rocks that had been under very high temperature and pressure. Into which category of rock can slate be placed?

• igneous

• metamorphic

• sedimentary

• volcanic

Joe found a beautiful rock while hiking. He didn't know what kind of rock it was, but he knew a test that could help him find out. He took a small ceramic tile out of his backpack and scraped the rock across it. Why did Joe do that?

• He wanted to make the rock have a shiny luster.

• He wanted to test the hardness of the rock.

• He wanted to break the rock so that he could check the cleavage pattern.

• He wanted to see the color of the line that the rock would make on the tile.

Tags

NGSS.MS-PS1-2

Some renewable resources must be carefully managed to be sure that there will be enough for people to use. Which of the following is the best example of a renewable resource that humans can never use up?

• trees

• sunlight

• oil

• natural gas

Florida can generate power for fuel and electricity from many of its natural resources. Which plentiful Florida natural resource could be used for generating power?

• coal

• phosphate

• river water

• sunlight

Mr. Misner likes to identify rock samples using several common tests. The tests tell him about the characteristics of the rock. Which of these characteristics is NOT one that Mr. Misner would commonly use to identify rocks?

• how a rock breaks apart

• how a rock scratches other minerals

• how shiny the surface of the rock is

• how a small electric current goes through the rock