Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

15 Cards in this Set

  • Front
  • Back
cinder cone
steep cone-shaped hill or mountian made of volcanic ash, cinders, and bombs piled up around a volcanos opening
composite volcano
tall cone shaped mountian where layers of lava alternate with layers of ash and other volcanic material
index fossils
fossiles of widely distributed organisms that lived during one short period
shield volcano
wide gently slpoing mountian made of laters of lava formed by quiet eruption
place where old eroded rock is in contact with a newer rock layer
point on earths surface right above an earthquakes focus
point beneath earths surface where rock breaks under stress causing an earthquake
p wave
type of seismic wave that compresses and expands the ground
s wave
type of seismic wave that moves the ground up and down or side to side
surface wave
type of seismic wave that forms when p and s waves reach earths surface
absolute age
age of the rock given as the number of years since the rock formed
one of the three long units of geologic time between the precambrian and the present
law of superposition
geological principal that states that in horizontal layers of sedimentary rock each layer is older that the one above and younger than the one below it.
the single ladmass the broke apart 225million years ago and gave rise to todays continents.
radioactive decay
breakdown of a radioactive element releasing particals and energy