Bouns
Which part of the EMR spectrum can you see?
Light
What is a light year?
How much light travels in a year.
How long ago was the Earth created?
4.6 Billion years ago
The theory of Continental Drift was proposed after the theory of Plate Tectonics.
True or False
False
What is radioactive decay?
Elements breaking overtime
What is the half-life of something that died at 50 years old?
25 years
What did the balloon lab represent?
The expansion of the universe.
What is relative age dating based on?
Position
What was the idea of Pangea?
All the continents were once all connected.
Do all animals leave behind a fossil?
No
What is radioactive decay?
Elements breaking overtime
What is redshift and when would it occur?
It’s when something is moving away from you.
What is Absolute Age Dating based on?
Specific times or dates
Scientists know the thickness and the composition of each layer of the earth by:
a) Creating boreholes that reach the core
b) Studying fossils and sea-floor spreading
c) Studying seismic waves
d) Scientists cannot accurately estimate this
C) Studying seismic waves
What was the model that ancient astronomers thought was the correct model of the solar system?
They though everything in the solar system was orbiting the earth.
What is the unit for frequency?
Hertz
What are the 3 sources of proof of the Big Bang?
-Redshift
-Direct Observation
-CMB
What are index fossils?
Fossils that are specific to one time period only
Who proposed the Continental Drift Theory?
a)Lord Kelvin
b)Alfred Wegener
c)Harry Hess
d)James Hutton
b.) Alfred Wegener
What are the 2 forces that keep an object in orbit? Why?
The position and velocity, because without out either on we would be sucked into the sun or thrown into space.
What is nuclear fission and what are the 2 elements?
The fusion of elements to make something new.
Hydrogen and helium
What does a low to medium mass star end up when it dies?
Black Dwarf
What are half lives?
Half of a life cycle
Where is the oldest oceanic rock found?
a)Near Mid-Ocean Ridges
b)Along Continents
c)Near Ocean Trenches
d)Subduction Zones
a) Near mid-ocean ridges
What is nuclear fission and what are the 2 elements?
The fusion of elements to make something new.
Hydrogen and helium