Grade 3 Science – Unit 6 Review

Which item would be the best model to show how living things break down and become part of the soil over time?

• A metal spoon

• A glass jar

• A moldy piece of bread

• A rubber eraser

Pebbles near a river slowly become smaller and smoother over many years. What causes this change?

• Animals stepping on the rocks

• Water flowing over the rocks again and again

• Sunlight heating the rocks each day

• Plants growing next to the rocks

Tags

NGSS.MS-ESS2-2

Which group of materials best represents what soil is made of?

• Dirt, dead leaves, and tiny rock pieces

• Toy blocks of different colors

• Glue and rubber bands

• Sugar, flour, and salt

Which action helps soil form naturally over a long period of time?

• Paving land with concrete

• Cutting down trees and removing plants

• Rain and wind slowly breaking rocks into smaller pieces

• Burning plants in a field

Tags

NGSS.MS-LS2-3

How does a volcanic eruption change Earth’s surface?

• It causes loud noises in the air

• It pushes lava that cools and hardens on the ground

• It makes the weather colder

• It scares animals away from the area

Tags

NGSS.MS-ESS2-2

What is a landslide?

• The ground shaking during a storm

• Lava flowing from a volcano

• Rocks, soil, and dirt moving quickly down a slope

• Water rising over land during heavy rain

Tags

NGSS.MS-ESS3-2

Which activity would best model an earthquake?

• Shaking a box with blocks inside

• Pouring water over sand

• Dropping rocks into a river

• Stacking rocks and leaving them still

Tags

NGSS.MS-ESS3-2

A student mixes baking soda and vinegar in a container, causing pressure that forces the mixture out. Which rapid Earth change does this experiment model?

• Flooding

• Landslide

• Earthquake

• Volcanic eruption

Which material could become part of soil?

• Broken plastic toys

• Decayed leaves and plants

• Aluminum foil

• Glass beads

Two containers hold different types of soil. The same amount of water is poured into each container. Which type of soil would NOT absorb much water?

• Soil with a lot of clay that sticks together

• Soil made mostly of sand with large spaces between particles

• Soil mixed with decomposed leaves and plants

• Soil that is dark and moist