Chapter 9 26-50 Astronomy

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The relatively few craters that we see within the lunar maria were formed by impacts occurred after those that formed most of the craters in the lunar highlands
When we see a region of planet that is not as heavily cratered as other regions, we conclude that the surface in the region is younger than the surface in more heavily cratered regions
Volcanism is more likely on a planet that has high internal temperatures
Shallow-sloped shield volcanoes are made from lava that has a medium viscosity
Steep-sided stratovolcanoes are made from lava that has a high viscosity
What type of stresses broke Earth's lithosphere into plates? the circulation of convection cells in the mantle, which dragged against the lithosphere
Which of the following describes tectonics? the disruption of a planet's surface by internal stresses
Which of the following describes erosion? the wearing down or building up of geological
Which of the following describes volcanism? the eruption of molten rock from a planet's interior to its surface
Which of the following describes impact cratering? the excavation of bowl-shaped depressions by asteroids or comets striking a planets surface
A planet is most likely to have tectonic activity if it has high internal temperature
What kind of surface features may result from tectonics? all of the above
What is basalt? a type of rock that makes relatively low-viscosity lava
How did the lunar maria form? large impacts fractured the Moon's lithosphere, allowing lava to fill the impact basins
Why does the moon have a layer of powdery "soil" on its surface? its the result of gradual erosion by micrometeorites striking the Moon
The Caloris Basin on Mercury covers a large region of the planet, but a few smaller craters have formed on top of it. From this we conclude that the Caloris Basin formed toward the end of the solar system's period of heavy bombardment
Why do we think Mercury has so many tremendous cliffs? they were probably formed by tectonic stresses when the entire planet shrank as its core cooled
Olympus Mons is a shield volcano on Mars
Valles Marineris is a large canyon on Mars
Which of the following does not provide evidence that Mars once had flowing water? the presence of vast canals discovered in late 1800s by Giovanni Schiaparelli and mapped by Percival Lowell
The polar caps on Mars are composed of mostly solid carbon dioxide and some water ice
How have we been able to construct detailed maps of surface features on Venus? by using radar from spacecraft that were sent to orbit Venus
Which two geological processes appear to have been most important in shaping the present surface of Venus? volcanoes and tectonics
Which of the following show evidence of ancient river beds? Mars
Spacecraft have landed on all the terrestrial worlds except? Mercury

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