The “Big Bang” erupted from some energy the size of __________?
Smaller than an atom.
100
What was the first form of life on Earth?
Bacteria.
100
What was “Pangea?”
When all the continents were mashed together into one, big continent.
100
What have been the biggest explosions in the universe since the Big Bang?
Super Novas (star explosions)
100
On early Earth there were no rivers, lakes or oceans. Where did the water come from to eventually make these?
Water vapor in the atmosphere.
200
How long did the eruption take to be the size of a galaxy?
Less than a millionth of a second.
200
A lot of oxygen led to the “Cambrian Explosion.” What was that?
Many new life species popped up all at once.
200
Of what type of stone were the Egyptian pyramids made of?
Limestone.
200
How long ago was Earth formed?
4.5 billion years.
200
What was the “most important waste product” in Earth’s history?
Oxygen, from algae and other green plants
300
How much of the energy in the universe today was included in the Big Bang?
100%
300
What key reptile development led to them being able to travel far from the sea?
Hard covered eggs that didn't need to be laid in water.
300
How did the growth of grasslands affect human evolution?
More grass = less trees; less trees = primates having to survive on the ground and not only in trees.
300
What protects Earth from some of the Sun’s more harmful rays & particles?
Our magnetic field.
300
For life on land to happen, what “protection” had to begin in the atmosphere?
The ozone layer to stop harmful rays from the sun.
400
What was the first and most basic element from which all other stuff in the universe is made?
Hydrogen.
400
What caused “The Permian Extinction” in which 70% of life on Earth died?
When increased volcanic activity greatly increased carbon dioxide gas.
400
Why did primates have to begin to walk on 2 legs instead of 4?
To see over the grass for predators.
400
How was the moon created?
An object the size of Mars hit the Earth. Much of it was absorbed, but the extra stuff orbited around the Earth until gravity brought it together into our moon.
400
Before it was coal, what was it millions of years ago?
Organic material (used to be alive, like animals & plants).
500
What are “element factories” where hydrogen is turned into other, heavier elements?
Stars.
500
When that asteroid hit Earth, it killed off every animal over ________ pounds.
50 pounds.
500
How did walking on 2 legs improve our tool making capability?
It freed up our hands for tools instead of walking and climbing.
500
What caused Earth to be tilted on its axis?
The moon collision.
500
What 2 physical differences allowed mammals to progress over other animal groups?
Eyes together for depth perception & opposable thumbs for grasping.