Earth's History One
This theory is how astronomers explain the way the universe began.
Big Bang theory
True or False?
Plaentesimals form through the process of accretion.
True!
The word lithos, for lithosphere means which of the following?
rock magma
asphalt convection current
rock
Scientists who study Earth and the processes that have shaped Earth over time.
Geologist
Compounds made of carbon, all living things or once living things.
organic
4.5-4.8 billion years
Which period of time is the longest in geologic time?
Eons
Eras
Periods
Epochs
Eons
Asthenosphere
Objects that are formed primarily of compounds other than carbon and hydrogen are said to be this...
inorganic
Rock that makes up the continents and the land, not the water.
When large objects grow or enlarge and form layers due to gravity and spinning, this is called what?
Accretion
During this Eon the first life forms were created, which were what type of cell, prokaryotic or eukaryotic?
Archean-prokaryotic, bacteria like
This layer of the earth is liquid and is part of the earth's magnetic field.
Outer core
Minerals are solid, naturally occurring ______________ solids with a crystal structure and chemical composition.
inorganic
What are the two types of crust found on land and in the water?
continental and oceanic
How was the moon formed?
Theia the meteor collided with Earth. The dust and debris from the collision formed the moon through accretion.
Which eon in Earth's timeline were the first prokaryotic bacteria formed?
Archean Eon
This layer of earth is a solid and is parrt of the earth's magnetic field.
inner core
The crust of the earth that is very rocky, meaning a round rock.
This layer of Earth is made of silicon, oxygen, aluminum, iron and calcium.
crust
What was one defining characteristic of the Hadean Eon?
Theia collided with Earth.
Earth had a toxic atmosphere.
Violent time with intense volcanic activity.
What was the defining characteristic of the Proterozoic Eon?
Oxygen, through the great oxidation event, started to form our atmosphere.
Supercontinents were forming.
Explain what happens inside the mesosphere or mantle
Convection currents help our plates move
This layer of Earth contains convection currents.
mesosphere
The younger part of Earth's crust found beneath the waters.
oceanic crust