All elements in the universe except for the first five (H, He, Li, Be, B) were created by nuclear fusion within _____.
13.7 (on quiz 1)
The universe began with the Big Bang, which occurred _____ billion years ago. (xx.x) (on quiz 1)
lower (on quiz 1)
We know that the universe is expanding due to the Doppler effect, which causes light sent from objects moving away from us to have _______ frequency. (on quiz 1)
The nebula from which the Solar System was formed began to spin faster as it condensed due to conservation of __________. (2 words)
accretion disk (on quiz 1)
After the sun was formed, matter from the ____________ around the sun came together to form planets. (2 words) (on quiz 1)
What type of dating, involving decay from parent isotopes to daughter isotopes, has allowed scientists to figure out Earth's age? (2 words)
electromagnetic and strong forces
What two forces battle to keep a nucleus stable or unstable? (alphabetical order) ("_______ and _______ forces")
planetoid (on quiz 1)
The moon is thought to have formed when a ______ collided with Earth. (on quiz 1)
Each layer of Earth has a higher _______ than the layer outside of it. In other words, the planet is STRATIFIED by _______.
primary (on quiz 1)
P-waves, or _______ waves, are BODY waves that CAN travel through both solids and liquids. (also known as "pressure waves") (on quiz 1)
secondary (on quiz 1)
S-waves, or _______ waves, are BODY waves that CANNOT travel through both solids and liquids. (also known as "shear waves") (on quiz 1)
Lots of harmful solar radiation reached the early Earth's surface because there was no ______ layer.
iron and nickel
The two major elements that form Earth's core are _____ and _____. (alphabetical order) ("_____ and _____")
The S-wave "shadow zone" reveals the Earth's (solid/liquid) (inner/outer) core. (i.e., "liquid inner")
The P-wave "shadow zone" reveals the Earth's (solid/liquid) (inner/outer) core. (i.e., "liquid inner")
In S-waves, the direction of particle motion is __________ to the direction of wave propagation.
In P-waves, the direction of particle motion is __________ to the direction of wave propagation.
When seismic waves pass from one material to another having different density, the wave energy is bent, or _______.
Fermat's Law (on quiz 1)
Between two given locations, A and B, the seismic wave travels along a path that takes the shortest time from A to B. This is called: (on quiz 1)
A seismic wave does not take a direct path through the Earth due to changes in _______ inside the planet.
Layer of planet containing the upper mantle. Ductile rather than rigid. Material is like a slushie rather than solid or liquid.
Even though pressure increases with depth, deep rocks will still start to melt or deform due to the increase in __________.
Idea, proposed by Harry Hess, that continental drift is driven by convection beneath the crust, driving oceans to expand.
Device that measures the magnetic field at a given location; used to expose symmetric patterns of magnetic reversals around mid-ocean ridges.
A rock gets permanently magnetized once it cools past the _____ point, around 580 degrees Celsius.
Earth has plate tectonics and other planets don't because Earth has ______ in liquid form, which acts as a lubricant!