ESC1000 Exam 1 Review Part 4
picture
Drag events so that they are in the correct order, from oldest at the bottom (6) to youngest at the top (1).
the atmosphere lacked oxygen.
Early Earth would have been inhospitable to many life forms of today because
through photosynthesis by cyanobacteria
How did an oxygen-rich atmosphere develop from a carbon dioxide-rich atmosphere?
Older rocks are tilted, eroded, and overlain by younger rocks.
How does an angular unconformity form?
The dike is younger than the lower unit but older than the upper unit. (picture)
How would we use isotopic ages to infer the ages of the upper and lower unit in this diagram?
2 half lives
If a rock started with 1,000 atoms of a parent but now contains 250 atoms, how many half-lives have passed?
Mesozoic
In which of the following time periods were dinosaurs the dominant creatures?
unconformity
Missing geologic time caused by erosion is called a(n):
the granite (4) (Picture)
Of the following numbered units, which is the oldest?
unit 9 (picture)
Of the following numbered units, which is the youngest?
on land (picture)
The fossil ferns in this photograph probably indicate that the rock was deposited
that the lava flow is younger than the landscape surface partially covered by the lava flow. (picture)
The geologic relationships in this figure indicate
fossil data.
The geologic timescale details and divides geologic time based upon
over 4 billion years old.
The oldest known rock found on Earth is dated at
for half of the parent atoms to decay into daughter atoms.
The term half life represents the time it takes
picture.
These figures show three types of unconformities. Drag the name for each type of unconformity to the correct figure.
Picture
This figure shows the geologic timescale. Drag the label for each period to its correct position on the geologic timescale.
A (picture)
This figure shows the main subdivisions of the geologic timescale. Which of these is the Cenozoic?
James Hutton
Who came up with the concept that geologic processes operating at present are the same processes that operated in the past?
The granite is younger because it crosscuts the diorite. (pic)
This photograph shows light-colored granite and darker diorite (both igneous rocks). Which of the following statements is true?
abrupt changes in the types of fossils, representing mass extinctions
Upon what basis were the upper and lower boundaries of the Mesozoic Era defined?
1 (picture)
Using the data in this table, calculate the number of half-lives that have passed for the dike (unit D on this table).
1,500,000,000 (picture)
Using the data in this table, determine the age of the granite (unit G on this table).
Whether the creature had hard parts and how fast it was buried.
What factors are the most critical in determining whether a fossil is preserved?
erosion of a canyon by a river (picture)
What is the youngest event represented in this block diagram?
unconformity
What type of feature is represented by the boundary between geologic units 2 and 3?
unconformity (picture)
What type of feature is shown in this photograph of Siccar Point, Scotland?
All of these choices are correct. (picture)
What would fossil ages from the geologic timescale tell us about the age of this unconformity?
1 (picture)
Which numbered layer in this photograph represents the oldest layer?
Precambrian
Which of the following is the earliest (oldest) chapter of geologic time?
1 (picture)
Which of the four numbered features on this figure is the oldest?
4 (picture)
Which of the four numbered features on this figure is the youngest?
cross-cutting relations
Which principle can be used to determine the relative age of an igneous intrusion called a dike?
superposition
Which principle is used to determine the age of rocks by ordering them from oldest on the bottom to the youngest on the top?
cross-cutting relations (picture)
Which principle of relative age dating can be used to determine when the river formed on the landscape?
1 2 3 4 (picture)
Which sequence of numbers reflects the order in which the layers were deposited?
