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
Reading...
Front

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

image

Play button

image

Play button

image

Progress

1/5

Click to flip

5 Cards in this Set

  • Front
  • Back
The ______ hypothesis states that the extinction of the dinosaurs was facilitated by an large _______ hitting Earth.
Alvarez, asteroid
__________ _________ are small crystallized minerals found throughout Earth’s crust.
Zircon Crystals
Early life on Earth is hypothesized to be similar to life surrounding _________ in the deep oceans, where energy from hydrogen sulfide is used.
Hydrothermal vents
The amount of oxygen in our current atmosphere is a result of billions of years of photosynthesis by ___________.
cynanobacteria
The magnetic field of Earth protects us against the ________ which is radiation given off by our sun.
Solar Wind