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Astronomy Ch. 20
Terms in this set (12)
When Earth formed, it melted and differentiated. What was the source of heat that melted Earth?
The infall of matter that formed Earth and the decay of radioactive elements.
How do P waves and S waves differ?
P waves oscillate parallel to their direction of travel, whereas S waves oscillate perpendicular to their direction of travel and P waves can pass through liquids, whereas S waves cannot.
How do temperature and pressure vary with depth deep inside Earth?
Temperature and pressure both increase with depth.
What distinguishes Earth's inner core from its outer core?
The inner core is solid, and the outer core is liquid
What creates Earth's strong dipole magnetic field?
Convection in Earth's outer liquid iron-nickel core combined with Earth's rotation
What erases the impact craters on Earth and is responsible for most of the landforms that we see?
plate tectonics and water and ice erosion
What evidence do we have that Earth's outer core is a metallic liquid?
S waves are blocked resulting in an S-wave shadow zone and Earth has a strong magnetic field.
What drives the moving plates of Earth's crust?
convection in Earth's rocky mantle
Where on Earth are two plates being pushed apart and new crust created?
along the center of the Atlantic Ocean and along the center of the Red Sea
What is the likely source of Earth's early atmosphere that consisted of carbon dioxide and water vapor?
It was outgassed from Earth's interior during volcanic activity and it arrived in the form of icy planetesimals that impacted Earth.
What happened to the majority of the carbon dioxide that was formerly in Earth's atmosphere?
Most of it dissolved into the oceans and now is in the form of limestone rocks of Earth's crust.
Why would a decrease in the density of Earths ozone layer cause public health problems?
The ozone layer blocks ultraviolet light from the sun, and ultraviolet light causes skin cancer.
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