GEO 401 Exam 2 Questions And 100%
Verified Answers | Latest 2025/ 2026
Update | Graded A+
The only other planet in the solar system besides the Earth thought to
be tectonically active is _____________. - CORRECT ANSWER-venus
The oldest continental crust contains rocks as old as ____________. -
CORRECT ANSWER-4 billion
Where are the oldest rocks in North America located? - CORRECT
ANSWER-in the canadian shield
Isostasy is the balance (equilibrium) between buoyancy forces that push
a continent up and down. Let's use water and ice as an example to
understand isostasy. We know that ice flows on water bc it is less dense.
Elevation of an ice cube is a function of the density difference and
thickness of the ice layer. Which of the following statements is FALSE? -
, CORRECT ANSWER-Ice is ~10% lighter in density than water. Thus, ~90%
of the ice cube will submerge under water.
Building Blocks of Life include: - CORRECT ANSWER-All of the above
- water
- carbon, hydrogen, and oxygen
-nutrients and energy
One particular group of bacteria, the cyanobacteria or "blue-green
algae," have left a fossil record that extends far back into the
Precambrian - the oldest cyanobacteria-like fossils are nearly 3.5 billion
years old, among the oldest fossils currently known.
___________________ record the presence of microbial mats during
the Archean. - CORRECT ANSWER-Stromatolites
Which of the following Earth systems powers the Earth's magnetic field
that can protect life on Earth's surface from harmful cosmic rays? -
CORRECT ANSWER-the geodynamo system in the Earth's core
Verified Answers | Latest 2025/ 2026
Update | Graded A+
The only other planet in the solar system besides the Earth thought to
be tectonically active is _____________. - CORRECT ANSWER-venus
The oldest continental crust contains rocks as old as ____________. -
CORRECT ANSWER-4 billion
Where are the oldest rocks in North America located? - CORRECT
ANSWER-in the canadian shield
Isostasy is the balance (equilibrium) between buoyancy forces that push
a continent up and down. Let's use water and ice as an example to
understand isostasy. We know that ice flows on water bc it is less dense.
Elevation of an ice cube is a function of the density difference and
thickness of the ice layer. Which of the following statements is FALSE? -
, CORRECT ANSWER-Ice is ~10% lighter in density than water. Thus, ~90%
of the ice cube will submerge under water.
Building Blocks of Life include: - CORRECT ANSWER-All of the above
- water
- carbon, hydrogen, and oxygen
-nutrients and energy
One particular group of bacteria, the cyanobacteria or "blue-green
algae," have left a fossil record that extends far back into the
Precambrian - the oldest cyanobacteria-like fossils are nearly 3.5 billion
years old, among the oldest fossils currently known.
___________________ record the presence of microbial mats during
the Archean. - CORRECT ANSWER-Stromatolites
Which of the following Earth systems powers the Earth's magnetic field
that can protect life on Earth's surface from harmful cosmic rays? -
CORRECT ANSWER-the geodynamo system in the Earth's core
