Leap Review

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.

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-LS2-3

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

NGSS.MS-PS2-5

The human body's mass consists of four major elements as shown.

Which of the following elements in the human body is represented by 10% on the pie graph?

• Oxygen

• Hydrogen

• Nitrogen

• Copper

Which of the following elements in the human body is represented by 10% on the pie graph?

• Oxygen

• Hydrogen

• Nitrogen

• Copper

What is the process by which plants use sunlight to synthesize foods from carbon dioxide and water called?

• Respiration

• Photosynthesis

• Fermentation

• Digestion

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

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 will study how Earth's magnetic field changes as distance from Earth changes. Satellites will be placed at different distances from Earth and will be used to measure the strength of Earth's magnetic field. What is the Dependent Variable?

• magnetic field strength

• distance from Earth

• size of satellite

• mass of satellite

• gravitational force of Earth

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5