Dcp

Scientist suggest that the movement of Earth's liquid iron core results in electrical currents. These currents would then result in Earth's magnetic field. Recent satellite data suggest that the strength of Earth's magnetic field has weakened by about 3.5 percent in some areas. In other areas, Earth's magnetic field strength has increased by about 2 percent. Which statement best explains the differences in Earth's magnetic field strength based on the movement of Earth's liquid iron core?

• The movement of Earth's liquid iron core stopped in both locations.

• The movement of Earth's liquid iron core changes direction in some locations.

• The movement of Earth's liquid iron core is the same in all locations

• The movement of Earth's liquid iron core increased speed in both locations.

Tags

NGSS.MS-PS2-5

Based on Figure 2 and Figure 3, A magnetic compass needle is able to detect the direction of Earth's magnetic North Pole. Over hundreds of thousands of years, the direction in which a compass needle points would ________.

• stay the same

• change

Based on Figure 2 and Figure 3, During a normal polarity period, a compass needle points mostly in the direction of the ________.

• geographic North Pole

• Equator

• geographic South Pole

Scientist are planning an investigation to collect evidence to help predict future magnetic pole reversals of Earth's magnetic field. Using information from figure 3, describe how scientists can collect data on changes in Earth's magnetic poles and explain how the data can be used to predict future magnetic pole reversals.

Tags

NGSS.MS-ESS2-3

Which statement about the forces acting on the balancing rock best explains the stability of the rock over time?

• No forces are acting on the rock

• the sum of the forces acting on the rock is zero

• the force of gravity is not acting on the rock

• the force of gravity is the only force acting on the rock

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Based on the information in the model, which statement best explains how DDT was introduced into eagle populations?

• The eagles absorbed the DDT directly from the air

• The eagles absorbed the DDT directly from the water

• The eagles absorbed the DDT after eating large fish

• The eagles absorbed the DDT after eating zooplankton

Tags

NGSS.MS-ESS3-4

NGSS.MS-LS2-4

The engineers observed that the skateboard floats above the track because the magnets on the skateboard ______ the magnets on the track.

• attract

• repel

• make contact with

Tags

NGSS.MS-PS2-3

When a rider steps onto the skateboard, the force between the skateboard and the track ____ .

• increases

• decreases

• stays the same

Tags

NGSS.MS-PS2-1

If the magnets are removed from the skateboard, the height of the skateboard should ____.

• increases

• decreases

• stays the same

Tags

NGSS.MS-PS2-2

Which property of the objects in the model has a larger effect on the motion of moon 1?

• the orbital paths of planet 1 and planet 3

• the rotational speed of moon 2

• the force of gravity from planet 2

• the force of gravity from planet 3

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

NGSS.MS-PS2-5