Rock Cycle
What type of rock forms from cooling magma and can look glass like?
igneous rock
In a column of rock strata where would the oldest rock be found?
the bottom
what is absolute dating?
using radiometric decay of elements to measure how old something is.
define density
how much "stuff" is in a given "space".
What is the theory of plate tectonics?
Earth's solid outer crust is separated into plates that move over the molten upper portion of the mantle, causing continental drift.
What type of rock is formed underground from heat and pressure?
metamorphic rock
In a column of rock strata where would the newest rock be found?
on top
Name an atom used in radiometric dating
carbon, uranium etc.
What layer of the earth is most dense?
the core
What is pangea?
the last supercontinent
What type of rock is formed from compacting and cementing?
sedimentary rock
What is an index fossil?
a fossil of an organism that lived in a very specific point in time. If you find this fossil in a rock, you can tell what time period the rock must have formed.
What was the oldest rock to ever be dated on earth?
4.4 billion year old zircon crystal
How do you find the volume of a cube?
LxWxH
who came up with the theory of plate tectonics?
Alfred wegener
What type of rock contains fossils?
sedimentary rock
What is relative dating?
It allows scientists to age rock in relation to one another (does not give the exact age, just which rock is older).
What element does uranium decay into?
lead
Who was archimedes and why did we learn about him?
he discovered the water bath method of finding a weird shaped objects volume.
How fast are the continents moving?
1-2 inches a year (same rate as your fingernails grow)
What type of rock is most common on the sea floor?
igneous rock
What does the law of superposition state?
oldest rock on bottom, youngest rock on top
What is the half life of uranium? (hint: it is very close to the age of the earth)
4.5 billion years
Describe how to find the density of a rock
use a scale to get the mass, use the water displacement method to get the volume and divide mass by the volume.
What evidence was used to support the theory of plate tectonics?
same fossils found on different continents, position of volcanoes and earthquakes around the world