1. the heat that drives the convection cells located in earth originates in the
crust.
inner core.
mantle.
outer core.

2. the hawaiian islands formed into their current shape because a magma plume ejected magma through a moving crust. this is a great example of
a divergent boundary.
hotspot activity.
the mid-ocean ridge.
oceanic trenches.

3. when an earthquake occurs, the actual point of earth movement is called and the point on the surface right above this is called the
asthenosphere / lithosphere
epicenter / focusfocus / epicenter
crust / mantle

4. in order to prevent a mass erosion event, such as the 1930s dust bowl, which of the following should farmers do?
remove worms, ants, and other organisms that live in the soil.
keep the land irrigated.
remove native grasses.

plant the same crops from year to year to acclimate the soil.

5. explain the scientific belief of continental drift. include the concepts of sea-floor spreading and subduction in your response.

6. many of the open land in your area is being turned into housing developments with roofs, roads, and driveways covering up the soil.
explain to your local planning board the functions soil serve and why it is important to preserve soil.

7. you just won a trip to journey to the center of the earth in an amazing new heat-resistant ship made of a transparent material. when you return, you are expected to write a paragraph explaining to middle school students, the convection cells you saw in
earth's mantle. write your rough draft here.

1)

Definitely, the heat that drives the convection cells located in Earth originates in the inner core. I consider this option to be correct as inner core is the Earth's innermost part and its temperature could be approximately 5400 °C, so I bet this is the most suitable option.

2)
According to the fact that magma plume ejected magma through a moving crust, this is a great example of a mid-ocean ridge, because this phenomenon consist of an underwater mountain system that were formed due to the plate tectonics. 
3)
 When an earthquake occurs, the actual point of earth movement is called crust and the point on the surface right above this is called the mantle. From the definitions of these two points you can see that their meaning cleanly coincides with the task.
4)
As far as I remember, in order to prevent a mass erosion event, such as the 1930s Dust Bowl, farmers should keep the land irrigated. They say that it is very important to overflaw dry area in order to keep it in satisfying condition.
5)
Some scientists take seafloor spreading  as a basis and claim that in neares future, slabs lithosphere will split apart from each other again due to tectonic activities. Also, they assume that there is a big possibility that soon  tectonic plates will crash into each other and won't spread. 
6) 
 The soil is the most essential point of the groving basis, its purpose is to make plants and trees grow, therefore we can make a conclusion that we can't imagine our life without it.
7) You can include such information as description of the motion of mantle material near the outer edge of it and show the model that clearly shows all the point you describe. Then you should tell about how things that you have seen can impact Earth.

I do hope it will be helpful!