Vocabulary
Preserved remains or traces of living things...
Fossils
A geologist finds an area of undisturbed sedimentary rock. The ______ layer is most likely the oldest
The bottom
What do geologists mostly study to develop the geologic time scale
Rocks and fossils
When did the first mammals appear
Who is the best teacher
MR. OCONNELL!
A vertebrate that controls its own body temperature and feeds milk to its young
mammals
Radioactive dating is a method used by geologists to determine the _____ age of rocks
Absolute
What is the geologic time scale
The geologic time scale is divided into chronostratigraphic units and their corresponding geochronologic units
During which era was the age of reptiles
The Mesozoic Era
What is the diameter of Earth?
7,917.5 mi
An animal with a backbone
Vertebrate
What method do geologists use to find the absolute ages of rocks
Radioactive dating
Into which units is the geologic time scale subdivided?
relative age
Which event occurred first in the Cenozoic era
Cretaceous-Paleogene extinction event
What is the symbol for Tin?
Sn
The number of years that have passed since a rock formed
Absolute age
How could a geologist match the rock layers in one area to rock layers found in another area
compare the characteristics of the rock layers
How do geologists use radioactive dating in developing the geologic scale
The relative proportions of radioactive atoms (parent atoms) and other atoms (daughter atoms)
Arrange the following in order from earliest to latest appearance: amphibians, jawless fish, trilobites, bony fish.
Trilobites, Jawless fish, Bony fish, and Amphibians
Where did the volcano Krakatau explode
Indonesia
An element is said to be radioactive when its particles become unstable and release energy in the form of radiation.
Radioactive decay
What term describes the time it takes for half of a radioactive element's atoms to decay
Half-life
A geologic time scale is a record of _____ and _____
geologic events and the evolution of life forms
What factors allowed new organisms to evolve and thrive during the Cenozoic era
The Cenozoic era allowed new organisms to evolve and thrive due to climate changes, continental drift, mass extinctions, adaptive radiation, and various biological interactions
What is the rarest blood type
Rh-null