Unit 2: The Origin and History of Earth Flashcards
Nebula
A cloud of hot gas and dust in outer space
Nebular Theory
The most widely accepted theory for how our solar system formed
Nuclear Fusion
Forcing together the nuclei of two atoms to create another atom. Stars use nuclear fusion in their cores.
Hydrogen Fusion
The fusion of two hydrogen atoms creates one heavier helium atom
Supernova
The explosion that comes from a dying stars collapse
Carbonaceous Chondrite
The type of meteor that brought water to Earth
Deuterium
Another word for “heavy” hydrogen that makes water heavier
How old is the universe?
An estimated 13.8 billion years old
How old is the solar system?
An estimated 4.6 billion years old
How old is the Earth?
An estimated 4.5 billion years old
What elements were present in the very early universe?
Hydrogen, helium and lithium
What are the heaviest elements stars can create in their cores while alive?
Iron, cobalt and nickel
What elements are created during the explosive death of stars?
Zinc, silver, tin, gold, mercury, lead, and uranium
