Exam 3 Flashcards
(91 cards)
What is impact cratering?
Arterial falling from space onto a world’s surface will create impact craters.
What do more craters indicate?
The number of craters can indicate the surface’s age. More craters means an older surface and minimal geologic activity.
Define Plate tectonics
The theory that explains how slow the motions within the Earth moves large segments of the crust (outer surface) gradual “drifting” of the continents.
How can volcanism change a surface?
Volcanic eruptions can erase craters.
What do we learn by studying earthquakes?
We learn about earth’s interiors. Earthquakes produce seismic waves, which travel differently through different materials.
Which of the following layers of the earths interior is composed of liquid metal?
The outer core
Define Convection
Rising and falling of hot/cold material
Crustal plates are moved by …
convection
How many major and smaller plates does earth have?
7 major plates and 6 smaller ones
Very fluid lava forms…
Shield volcanes
Viscous lava forms
Composite volcanoes
Define Erosion
On earth, liquid water strongly eroded the surface.
The geographic North Pole is magnetic North or South?
The magnetic South Pole
How was Earth’s crust shifted over time?
The movement of plate boundaries.
Define Continental drift
The movement of the earths crust. Proved by fossils near the riff zones.
How is Earth’s atmosphere unique?
Because of convection.
Define The green house effect
Carbon dioxide content of the retains heat from the sun through a process called the greenhouse effect.
How is the greenhouse effect beneficial or harmful?
Without, earth’s ocean would be frozen.
With, the earth is 40 degrees c hotter
The principal greenhouse gases in our present atmosphere are
Water vapor and carbon dioxide
Mercury Rotation
58 earth days
Mercury orbit
88 earth days
Mercury surface
Rocky, solid, and cratered surface much like the moon.
Mercury atmosphere
A thin atmosphere
Oxygen, sodium, hydrogen, helium, and potassium.
Mercury temperature
800 to -290 degrees.