Monday, December 30, 2013

ASTRO 101 QUIZ 9 - BOLD ANSWERS

 1. The parts of a terrestrial planet from the center out are
a. core, mantle, crust. 
b. crust, mantle, core.
c. mantle, core, crust

 2. Which of the following is not one of the four stages in the development of a terrestrial planet?
a. flooding
b. cratering
c. slow surface evolution
d. accretion 


 3. The youngest parts of Earth's crust are
a. the bottom layer found in the walls of the Grand Canyon.
b. the continents.
c. the continental boundaries.
d. the midocean rifts. 


 4. The energy that moves the plates of Earth's crust comes from
a. the solar wind.
b. convection from the mantle. 
c. tides in the oceans.
d. friction between wind and the land surface.


 5. The central regions of Earth's core are a solid because
a. the composition at the center of the core is lower in iron.
b. the pressure at the center is extreme. 
c. the magnetic field cannot penetrate into the center of the core.
d. convection does not extend all the way to the center of the core.


 6. Which of the following provide evidence that Earth's core is at least partially molten?
a. P waves do not penetrate Earth's core.
b. S waves do not penetrate Earth's core.
c. S waves are reflected by Earth's core.
d. P waves are reflected by Earth's core.


 7. Earth's magnetic field is generated by the dynamo effect in the
a. molten metallic core. 
b. solid central core.
c. plastic mantle.
d. the crust.

8. The gas that is most responsible for the greenhouse effect on Earth is
a. oxygen (O2)
b. nitrogen (N2)
c. carbon dioxide (CO2)
d. ozone (O3) 

9. How are scientists able to study the interior of the Earth?
a. They study seismic waves that travel through the interior of the Earth. 
b. They monitor the changes in the Earth magnetic field.
c. They drill down to individual layers of interest.
d. They use X-rays to map out the interior.

 10. What is the most abundant gas in the Earth's atmosphere?
a. CO2
b. O2
c. N2 
d. CH4

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