Lesson #93:Density

Density is the relationship between which two properties?

Density is a measure of how (large / tightly packed) the particles are in a substance.

• large

• tightly packed

Density is one method used to sort plastics. Consider the chart. Choose the plastics that would float in water. (Remember, water has a density of I .00 g/ml.)

• PETE

• LPDE

• PVC

• PP

Tags

NGSS.MS-PS1-2

What would the other plastics do that did not float in the water?

• They would sink.

• They would float.

Water in the ocean is constantly warmed by the sun and eventually evaporates. Then it will cool and condense, releasing a great deal of energy into the air. Which two choices describe how the convection cycle of evaporation and condensation help the earth?

• maintains a balance of moisture across the globe

• helps to spread heat so that all areas of the earth are warmed

• prevents static electricity from building up in the atmosphere

Tags

NGSS.MS-ESS2-4

NGSS.MS-ESS2-6

Which of these is responsible for nitrogen fixation?

• animals

• plants

• bacteria

Tags

NGSS.MS-LS2-3

What type of symbiosis is helpful to both organisms?

• commensalisn

• mutualism

• parasitism

Which explains why there is very little plant life in the ocean's benthic region ( the deepest part)?

• No light reaches the ocean floor.

• It is very cold in the benthic region

• Both of these statements are true.

Tags

NGSS.MS-LS1-5

true or false: Reptiles can breathe through their skin.

• true

• false

In a compound light microscope, compound refers to the number of

• lights

• lenses

• images