Fossils
How Old Is It?
Layers of Time
Geologic Time
Organisms
100
The preserved remains or traces of organisms that lived in the past
What is fossil?
100
The age of a rock compared with the ages of other rocks is known as what?
What is Relative Age?
100
What law states that in an undisturbed rock layer, the oldest is always at the bottom and the youngest is at the top?
What is the Law of Superposition?
100
Earth’s earliest atmosphere lacked which gas that is necessary for life as we know it to exist today?
What is Oxygen?
100
During the Paleozoic Era, the first organisms to live partly on land were
What is Amphibians?
200
A(n) ____________________ fossil forms when dissolved minerals replace the remains of an organism and then harden to form rock.
What is cast?
200
The time it takes for half of the radioactive atoms in a sample of a radioactive element to decay is the element’s ____.
What is Half-Life?
200
Which layer came first - C or F?
What is F?
(its towards the bottom)
200
What were the climates of Europe and North America during the 1.8 million years of the Quaternary Period?
What is ice ages and melting glaciers?
200
Jawless fish were Earth’s first ________, or animals with backbones.
What is Vertebrate?
300
Footprints and trails are examples of ___ fossils.
What is Trace?
300
The actual number of years that have passed since a rock’s formation is the rock’s _____.
What is Absolute Age?
300
What is layer A called?
Is it older or younger than layer G?
What is Intrusion?
What is younger?
(Intrusions are always younger than the rock around them.)
300
Which eon and era are we currently living in?
What is Phanerozoic Eon, Cenozoic Era?
300
The first hooved mammals fossils have been found and dated to roughly 60 million years ago. In what era can we find these organisms?
What is Cenozoic?
400
Fossils can be found in primarily what type of rock?
What is Sedimentary?
400
There is a gap between D and C in some places. What is this gap called?
What is Unconformity?
400
What is the correct order of categories for the Geologic Time Scale from largest to smallest?
Eon
Era
Period
Epoch
400
Wiwaxia, a type of fern plant, lived on Earth roughly 500 million years ago. Name this era.
What is Paleozoic?
500
Scientists can determine the age of a fossil by determining the amount of the remaining ____ isotope.
What is carbon-14?
500
How old is a rock that has 12.5% Potassium-40 remaining?
What is 3.75 billion years?
500
What is Y called?
Is it older or younger than A?
What is a Fault?
What is older? (A is above the fault)
500
Put the following in order from oldest to youngest:
A) Oceans form on Earth’s surface as it begins to cool and harden
B) Early single-celled bacteria release oxygen in the air
C) Earth is a ball of dust, rock, and ice in space; gravity causes accretion of material
What is C - A - B?
500
The Velociraptor, a dinosaur that they believe is also one of the first ancestors of birds, lived around 80 million years ago during which era?
What is Mesozoic?