# Question 2(Multiple Choice Worth 4 points) (03.02 LC) In what layer are convection currents found? Continental crust Inner core Asthenosphere Oceanic crust Question 3(Multiple Choice Worth 4 points) (03.02 LC) What forces the inner core of Earth to remain solid? Lack of water Low temperature Low density High pressure Question 4(Multiple Choice Worth 4 points) (03.02 MC) Scientists have observed that Earth's tectonic plates move in predictable directions. What is the cause of this observation? Uniform pressure inside Earth forces the plates to move Uniform temperature inside Earth forces the plates to move Variations in temperatures inside Earth forces the plates to move Vibrations in the core forces the plates to move Question 5(Multiple Choice Worth 4 points) (03.02 MC) If Earth was like a hardboiled egg, which part of Earth would the egg white represent? Mantle, as its depth is less than 2,900 kilometers Core, as its depth is less than 2,900 kilometers Mantle, as its depth is up to 6,500 kilometers Core, as its depth is up to 6,500 kilometers Question 6 (Essay Worth 4 points) (03.02 HC) Scientists have established that some of the layers of Earth are solid, some are liquid, and some are semi-fluid. Explain how the scientists are able to determine the liquid and solid layers. Use at least two pieces of evidence to support your answer.

Convection currents within the magma drive plate tectonics. Heat produced through the radioactive decomposition of elements buried in the interior of the Earth results in magma (molten rock) in the aesthenosphere. The aesthenosphere (70km to 250 km) is the mantle's part, the central sphere of the Earth that stretches up to 2900 km.

Answer 3:  D. High Pressure Explanation:

Despite the fact that the earth's inner core is evolving into liquid, it still remains solid, because of the very high pressure which keeps it compacted collectively even if the temperature is notably high. It was also suggested that Earth's inner core might turn into a unique crystal of iron.

Answer 4:  C. Variations in temperatures inside Earth forces the plates to move Explanation:

The Plates at the earth's surface tend to move due to the excessive heat in the Earth’s core which results in molten rock in the mantle layer to come into motion. It moves in a form known as convection cell that develops when hot material rises, cools, and finally sinks down. As the cooled matter sinks down, it is heated and consequently rises again.

Both the earth and an egg have a thin, crisp shell. The crust of the earth can be broken into bits, just like the cracked eggshell of a hardboiled egg. The mantle of the planet is analogous to the egg white, and the core of it is found in the center, like the egg yolk. Egg shell is considered as an example for crust, egg white for mantle and egg yolk for core.

Mantle is nearly 2,900 km thick forming the layer of the earth after crust and before core.

The earth's core is solid because of the high pressure upon it. Experts theorize that the extremely high temperature of the solid inner core is retaining the outer core in a semi-liquid form which allows the inner core to rotate at a slightly changed rate than the rest of the layers. This results in magnetic poles which redirect damaging cosmic rays from striking with earth. The study is the result of measurements through volcanic activity and sound waves.

Evidence:

Scientists study regarding the layers of earth deep inside the crust by examining how seismic waves propagate through the Earth. In case of earthquake somewhere, seismographs at many positions will record it.

If an earthquake occurs, locations far away from the occurrence notice the S and P waves propagation through deeper layers. Through measuring the arrival time of the waves, the velocity of the waves can be taken for a function of depth.

Furthermore, to know regarding the layers of the planet sound waves are transmitted through the earth. Due to the difference of densities between layers the waves will travel through them differently, we can comprehend that the sound waves are means to understand the layers of the earth.

## Related Questions

Describe polygenic inheritance and give an example.

Answer: Polygenic inheritance occurs when one characteristic is controlled by two or more genes. Often the genes are large in quantity but small in effect.

Explanation: Examples of human polygenic inheritance are height, skin color, eye color and weight. Polygenes exist in other organisms, as well.

Due the effects of alcohol on your __________, you may experience tunnel vision.

Explanation:

• Whenever there is loss of peripheral vision without their affect on central vision then tunnel vision occurs.
• In tunnel vision , a person is only able to see what directly lies in front of the eyes but the object in the periphery is not visible.
• There are many reasons why tunnel vision may occur and this is one of the many detrimental effects of alcohol.

Thus, a decreased peripheral vision results in the tunnel vision due to alcohol.

It will effect your Peripheral Vision

Yellowstone National Park has an average of about 4500 bison living in it. The park covers 3472 square miles. What is the population density of bison living in Yellowstone? a. 1.3 bison/mi
b. 16 bison/mi
c. 77 bison/mi
d. 0.77 bison/mi

(These are all squared, btw)

Population density is an important parameter in ecology, livestock management and human demographic. When we calculate the number of individuals on a set area (meters, miles, kilometers) it can give us valuable information about the population dynamics and help us in spatial planning and conservational efforts.

In our example, there are 4500 bison living on 3472 square miles.

If we want to calculate the population density, or in other words, how many bison are there per one square mile we should divide the number of bison with the miles

It would be A) 1.3 Bison/mi

There is a need to organize Groups and Divisions to ensure appropriate levels of span of control. The Groups and Divisions can be organized into: a. Companies.
B. Branches.
C. Regiments.
D. Units.