Why do scientist refer to Earth's mantle as a plastic?
a. The mantle has the properties of a solid, but can flow under pressure.
b. The mantle has the mixed properties of a solid and a liquid.
c. The mantle frequently shifts between its states of matter.
d. The mantle is a softer solid as it approaches the core.
e. The mantle has the properties of a liquid, but is limited in its movement.
Question 2The age of a star cluster can be approximated by finding its turnoff point in the distribution of data points that represent stars on the H-R Diagram.
a. True
b. False
Indicate whether the statement is true or false
Question 3What is a characteristic of all terrestrial planets?
a. They all have water.
b. They all have a rocky surface.
c. They all have a thick atmosphere.
d. They all have weather patterns.
e. They all have a very geologically active surface.
Question 4Observing star clusters will give astronomers needed data for stellar evolution because all the stars are the same age.
a. True
b. False
Indicate whether the statement is true or false
Question 5The ____ couples convection in the liquid core with Earth's rotation to produce electric currents that are believed to be responsible for Earth's magnetic field.
a. albedo
b. bow shock
c. axis rotation
d. convection currents
e. dynamo effect
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