1st 9 Weeks Exam Review

Why is the inner core solid?

• heat
• pressure
• because iron is always solid

Something that is always true and is expected to happen every time is called a _____

• conclusion
• hypothesis
• scientific theory
• scientific law

When experimenting with the growth of a plant, a scientist uses three plants, two different fertilizers, equal light, and equal water. What type of variable is the water?

• Dependent
• Independent
• Constant
• Outcome

In what layer of the earth do convection currents occur?

• crust
• mantle
• core

Put the layers of Earth in order from densest to least dense.

• A. Crust, Mantle, Inner core,Outer coreB. Inner core,Mantle, Outer core,CrustC. Crust, Mantle, Outer core,Inner coreD. Inner core,Outer core,Mantle, Crust
• crust, core, mantle
• Mantle, core, crust
• core, mantle, crust

Which layer plays the greatest role in the movement of the tectonic plates?

• crust
• mantle
• outer core
• inner core

According to the physical layers of the earth, which layer is the strongest, lower part of the mantle?

• lithosphere
• asthenosphere
• mesosphere
• inner core

Which compositional layers of earth make up the lithosphere?

• inner and outer core
• outer core and mantle
• mantle and crust

I want to see how the amount of water affects plant growth.  What is the independent variable?

• amount of water
• plant growth
• type of plant
• soil type

A testable idea or explanation that leads to a scientific investigation is called (can be stated as an if/ then statement)

• conclusion
• experiment
• hypothesis