A student creates a ball-and-stick model to represent the atomic scale of a substance. Which of these best describes the model?

• 1 molecule with 10 atoms

• 1 element with 10 molecules

• 10 molecules representing 10 elements

• 10 elements representing 10 molecules

Tags

NGSS.MS-PS1-1

Which statement best compares the two waves?

• Wave 1 has a higher frequency because it has a longer wavelength than wave 2.

• Wave 1 has a higher frequency because it has a higher amplitude than wave 2.

• Wave 2 has more energy because it has a higher amplitude than wave 1.

• Wave 2 has more energy because it has a higher frequency than wave 1.

Tags

NGSS.MS-PS4-1

Pick a word in each set of options to best describe relationships between interacting parts of the human body.

The human body is composed of systems with interacting parts. Organ systems are made of (organs / organelles / tissues), which are composed of specialized cells that work together to form (organs / organelles / tissues). Each cell of the human body contains (organs / organelles / tissues) with a specific function.

• organelles, organs, tissues

• tissues, organs, organelles

• organs, tissues, organelles

Tags

NGSS.MS-LS1-3

During an experiment, a teacher uses a flashlight and shines the light toward a pane of clear glass with a black iron backing. A diagram of the experiment is shown above.

Describe the path of the light as it travels from the flashlight to the air.

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

Describe the path of the light as it travels from the air to the pane of clear glass.

Tags

NGSS.MS-PS4-2

Explain why the students would not see the light travel through the black iron backing.

Tags

NGSS.MS-PS4-2

A scientist hiking in a desert observes a cliff. The scientist makes a drawing of the layers of rock in the cliff and the types of fossils observed in the layers. Based on observations, the scientist determines layers 3 and 5 were formed from cooled lava. The scientist's drawing is shown above.

Identify the oldest layer in the rock cliff and explain your reasoning for the layer chosen.

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-3

NGSS.MS-LS4-1

Explain how the environment has changed over time at this location. Include evidence in your explanation.

Tags

NGSS.MS-ESS1-4

NGSS.MS-ESS2-2

NGSS.MS-LS4-1

A scientist claims that volcanic eruptions caused dinosaurs to become extinct at this location. Decide whether you agree or disagree with the scientist's claim and then explain your decision.

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1

A student makes a model of the solar system on a poster board. The student uses foam balls to represent objects in the solar system. The student's model is shown above.

Explain one error concerning the size of the foam balls in the model.

Tags

NGSS.MS-ESS1-3