Big 20's
Which earth system formed when life first emerged on the planet?
biosphere
How many of earth's systems formed during the Pre-Cambrian?
All 4
During the paleozoic era _______ ice appeared on the planet for the first time which results in the glacial-interglacial cycle.
permanent
The word "sphere" means
cycle
Geo or geosphere means
rock
What is the period in earth's climate when temperatures are warn and ice is limited to the North and South Poles?
Interglacial
Earth became the only planet in the solar system to retain ________.
liquid water
Name 2 types of animals that evolved during the Paleozoic Era.
insects, fish, amphibians, reptiles, and tetrapods
What are the 3 major groups of the biosphere?
bacteria, archaea, and eukarya
Atmo or atmosphere means
air/gas
The amount of time required for 1/2 of the radioactive parent isotopes to decay into stable daughter isotopes is called?
half-life
Life was ________ and relied on _______ to survive.
single celled, water
Life was single celled and relied on water to survive.
Which mountains did the merging of Pangea create?
The Appalachian Mountains
The biosphere formed when _________ began.
life
Hydro means
water
Another name for radiometric dating is?
absolute age dating
What is another name for micro-continents?
shields
What is an example of vascular tissue in plants that moves water?
roots and stems
The first rock types on Earth were _______ and ________.
igneous and metamorphic
Bio means
life
When organisms change in response to a change in their DNA or environment, this is called?
adaptation
How much of earth's history does the Pre-Cambrian Eon cover?
the first 4 billion years or around 90%
What does paleozoic mean?
old or ancient
Name Earth's 4 major systems
geosphere
biosphere
hydrosphere
atmosphere
Smaller units of time are called _______.
periods