A student examined a patch of mud and recorded several statements about footprints in the mud. Which statement is most likely an inference?

• There are five footprints in the mud

• The depth of the deepest footprint is 3 centimeters

• The footprints were made by a dog

• The footprints are oriented in an east-west direction

Answer explanation

The statement about the dog is an inference because it was not OBSERVED. You can observe the other 3 things or measure them. They are observations.

Which statement best illustrates a classification system?

• A glacier melts at the rate of one meter per year.

• Ocean depths are measured by using sonar.

• Snowfall predictions for winter storms vary.

• Stars are grouped according to their color.

Tags

NGSS.MS-LS4-2

A student is asked to classify several rocks. For best results, the classification should be based on

• inferences

• interpretations

• hypotheses

• observations

Tags

NGSS.MS-ESS1-4

The diagram represents a solid object with a density of 3 grams per cubic centimeter.

What is the mass of the rectangle?

(hint: find the volume first)

• 0.5 g

• 2 g

• 18 g

• 36 g

The diagrams represent two different solid, uniform materials cut into cubes A and B.

What is the density of cube A?

• 0.2 g/cm³

• 5.0 g/cm³

• 12.8 g/cm³

• 64.0 g/cm³

Answer explanation

D= M/V

D= 320/64

At 7:00, the air pressure was 1,012 millibars. By 11:00, the air pressure had dropped to 1,004 millibars. What was the rate of change in the air pressure?

• 16 mb/hr

• 2 mb/hr

• 8 mb/hr

• 4 mb/hr

The temperature of water in a container was 60° C. Ten minutes later, the water temperature was 35° C. What was the rate of cooling of the water?

• 25 C°/min

• 2.5 C°/min

• 35 C°/min

• 3.5 C°/min

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Scientists can plan to photograph a solar eclipse because most astronomical events are

• cyclic and predictable

• cyclic and unpredictable

• random and predictable

• random and unpredictable

Tags

NGSS.MS-ESS1-1