HMH Module

An astronomer uses parallax to determine a star’s distance from Earth. Which statement correctly describes parallax?

• Stars closer to Earth will have a dimmer appearance.

• Stars farther away from Earth will have a dimmer appearance.

• Stars closer to Earth will appear to have a greater shift in position.

• Stars farther away from Earth will appear to have a greater shift in position.

Answer explanation

Parallax can be used to measure the distance to an object based on the size of the apparent shift in position when the object is viewed from two places. The bigger the apparent shift in position is, the closer the object is to the viewer.

Tags

NGSS.MS-ESS1-3

Which statement describes a limitation of the model?

• It cannot show how the planets orbit the sun.

• It cannot show the relative sizes of each planet.

• It does not show the gravitational force exerted by each planet.

• It does not show the order of the planets, from closest to the sun to farthest from the sun.

Tags

NGSS.MS-ETS1-1

The table shows events that led to the current theory that the sun is the center of the solar system.

• 1, 2, 3

• 1, 3, 2

• 2, 1, 3

• 3, 1,2

Tags

NGSS.MS-ESS1-1

The dotted lines in the picture show orbital paths of objects.

Which object orbits E?

• Object A

• Object B

• Object C

• Object D

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Is this model to scale regarding the sizes of the planets and distances between them? Why or why not?

• Yes. That's why the outer planets are showin in a separate table

• No. The distances in the solar system are too great to produce a model accurate to distance that still has inner planets visible.

• No. The outer planet distances are drawn to scale, but the inner planets need to be drawn farther from the sun to be visible.

Answer explanation

The sizes of the planets and their distances from the sun make it nearly impossible to show both scale in a model that fits on a single page.

Tags

NGSS.MS-ESS1-3

Based on the model, why are Ceres and Pluto classified as dwarf planets rather than planets?

• Ceres and Pluto are both round

• Dwarf planets have irregularly shaped orbits and planets have elliptical orbits

• Neither Ceres nor Pluto has cleared its orbital path of other objects

Answer explanation

The plents in the model have cleared their orbit paths, but Ceres and Pluto have not so they cannot be true planets. Ceres is in the asterioid belt, Pluto is in the Kuiper Belt, but true planets do not exist in orbital paths containing other large space ojects. Both planets and dwarf planets are round, and both types of ojects have elliptical orbits.

How do air masses cause weather changes!

• the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch.

• mass and forces the warm air to rise. As the warm air rises, its moisture condenses and forms tall clouds. As fronts move across Earth's surface, they produce changes in the weather. Triangles show the direction that a cold front moves.

• The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity

• A front forms where two air masses meet.

Tags

NGSS.MS-ESS2-5

An air mass usually brings the weather of ...

• its destination

• its source location

• its path of movement

• an undetermined source

Tags

NGSS.MS-ESS2-5

Which statement best explains why weather systems usually move from west to east across the United States?

• Fronts move from west to east.

• The jet stream moves from west to east.

• Pressure systems form over the Rocky Mountains and move east.

• Weather systems originate over the pacific Ocean and move east.

Tags

NGSS.MS-ESS2-6

Which bases are correctly paired? Select all that apply

• A with G

• T with C

• A with T

• G with C