Moon & Early Earth
Name of protoplanet that collided with Earth 4.5 bya
Theia
An element has 5 neutrons, 5 protons, and 6 electrons, What is the isotope name?
Boron-10, Carbon-12, or Boron-11?
Boron-10
(Element # same as #p and e, add p+n for isotope #)
Put these layers of the earth in order from deepest to most superficial: mantle, outer core, crust, inner core
inner core, outer core, mantle , crust
Height of a wave: wavelength, equilibrium or amplitude?
amplitude
Give TWO pieces of evidence of the Continental Drift Theory (Pangaea)
continents look like they fit like a puzzle, mountain ranges line up, fossils line up
What caused the Earth to tilt on its axis?
Impact from Theia
Time for a radioactive isotope to decay to 50% of its original amount
half-life
Which layer is solid but the rock is thick and plastic-like with the ability to flow?
lithosphere, asthenosphere, outer core
asthenosphere
How do you measure the wavelength of a wave?
crest to crest or trough to trough
Boundary where two plates moving toward each other
divergent boundary
Why is the moon's surface bumpy and irregular?
Impact of asteroids and comets
Carbon-14 has a half-life of 5,730 years. If 50% of carbon is left, then how old is the object?
5,730 years old
Which layer of the earth is liquid?
outer core
The number of wave cycles passing a point in one second
frequency
Boundary where mid-ocean ridges are formed
divergent
Due to the Giant Impact Theory, once could predict that the moon would contain how much oxygen if the Earth contains 45.2%?
Close to 45.2% (44.7% oxygen)
The half-life of Carbon-14 is 5,730 years. How old would the rock be if 75% of C-14 is found in it?
5,730 years/2 = 2,865 years
Put these layers of the earth in order by temperature (coolest to hottest) : inner core, outer core, mantle, crust
crust, mantle, outer core, inner core
Give TWO ways S and P waves move through the layers of the Earth differently.
s slower, can't move through liquid outer core
p waves faster, move through all layers
Which would subduct and why...oceanic or continental?
oceanic- more dense
Collisions, radioactivity and compression all caused what to change on planet Earth?
Hotter
The half-life of an isotope is 4 days. If you started with 1000 atoms of this isotope, how many atoms would be left after 8 days?
4 days / 8 days = 2 half-lives
(1000 atoms) (.5)(.5)= 250 atoms
What is the relationship between density and depth of the Earth's layers?
deeper layers more dense
Velocity = wavelength x frequency
A wave has a frequency of 20 Hz and a wavelength of 12 meters. What is its velocity? With correct units!
20 Hz x 12 meters = 240 m/s
What layer makes up the plates?
mantle & crust, asthenosphere, or lithosphere