Leap Science

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.

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

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 Independent Variable?

• magnetic field strength

• distance from Earth

• size of satellite

• mass of satellite

• gravitational force of Earth

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.

Scientist can use the ocean floor rocks to measure the amount of (force/time) between each change in (time/direction) of the magnetic poles.

Tags

NGSS.MS-ESS2-3

Scientist claim that tree growth glowed during the period from AD 1100 to 1300, resulting in thinner tree rings. Based on the information in Table 1, which statement can best be used as evidence to support the claim?

• More than 40 percent of the west in typically affected during dry periods.

• The average precipitation in the west significantly increased during this period.

• A large percentage of the west was affected by dry conditions during this period.

• The average precipitation in the west increased after AD 1300.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

What evidence from the graph best shows how the availability of corn likely affected the farming of domesticated turkeys in figure 1?

• An increase in corn production during the Great Drought increased the domestic turkey population.

• An increase in corn production during the Great Drought decreased the domestic turkey population.

• A decrease in corn production during the Great Drought decreased the domestic turkey population

• A decrease in corn production during the Great Drought increased the domestic turkey population.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

During the Great Drought, a decrease in the ______ had the greatest impact on the survival of the Anasazi people.

• growth of corn

• rabbit population

• growth of grass

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

As conditions changed, the Anasazi relied (more / less) on domesticated turkeys and (snakes / mice / rabbits) for food

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4