Upgrade to remove ads
Science Fossils, Periods etc.
Terms in this set (20)
Similar body structures, similar DNA, Patterns in early development
What evidence supports evolution?
number of different kinds
of organisms evolved.
was also when
animals began to spread widely on land
What happened in the Paleozoic Era? The Devonian Period
species of life on Earth died out
What happened at the end of the Paleozoic Era?
Reptiles were successful,
this time is often called the Age
What happened in the Mesozoic Era?
about 65 million years
ago, another mass extinction
hypothesize that this mass
extinction occurred when an
asteroid from space struck
What happened in the Mesozoic Era? Cretaceous
The extinction of dinosaurs
created an opportunity for
mammals. mammals evolved to live in
many different environments-on
land, in water, and even in the
What happened in the Cenozoic Era?
as a ball of dust, rock, and ice in
space. Gravity pulled this mass
How did Earth form?
geologists use it to show Earth's
What is the Geological Time Scale?
the atoms of one element break
down to form atoms of another element
What is radioactive decay?
scientists first determine the amount of
radioactive element in a rock. Then they compare that amount
with the amount of the stable element into which the radioactive
Determining Absolute Ages?
freezing and thawing, release of pressure, plant
growth, actions of animals, and abrasion.
Rocks and Weathering? Agents of mechanical weathering?
water, oxygen, carbon dioxide, living organisms,
and acid rain
Rocks and Weathering? agents of chemical weathering?
the type of rock and the climate.
Rocks and Weathering? How fast does weathering occur?
Weathering, erosion, and deposition
act together in a cycle that wears
down and builds up Earth's surface
Whats Mass Movement?
mudflows, slumps, and creep
What are the different types of Mass
Darwin hypothesized that species change
over many generations and become better
adapted to new conditions
What Was Darwin's Hypothesis?
Gaps in the geological record and folding can change
the position in which rock layers appear.
How Can Rock Layers Change?
Most fossils form when living things die and are buried by sediment. The
sediment slowly hardens into rock and preserves the shapes of the organisms.
What are fossils?
Fossils found in rock include molds and casts, petrified fossils,
carbon films, and trace fossils, other fossils form when the remains
of organisms are preserved in substances such as tar, amber, or
What are the kinds of fossils?
evidence about the history of
life and past environments on
Earth. The fossil record also
shows how different groups of
organisms have changed over
What do fossils show?
YOU MIGHT ALSO LIKE...
Chapter 7 A trip through Geologic Time (not includ…
Earth Science Unit 6: Geologic Time Scale
Science Unit Exam
Science Chapter 10: A Trip Through Geolo…
OTHER SETS BY THIS CREATOR
Vocab 4th Quarter ELA
World Geography Unit 6 Pre-Test/Post-Test