Along with Charles Lyell
Which of the following is a correct assumption about the age of the rock layers in the Grand Canyon?
Which of the following is a correct assumption about the age of the rock layers in the Grand Canyon?
The metamorphic rock layers at the bottom of the canyon are older than the sedimentary layers at the rim of the canyon.
What hypothesis paved the way for the present theory of plate tectonics?
In the early 20
th
century, a scientific theory called
continental drift
was proposed about this migration of the continents. That theory was initially ridiculed, but it paved the way for another theory called plate tectonics that scientists have now accepted to explain how Earth’s continents move.
What would happen to the Earth if it orbited further away from the sun than it does now quizlet?
What would happen to the Earth if it orbited further away from the Sun than it does now?
The Earth would have a lower surface temperature
.
Which feature of Wegener’s idea of continental drift contributed to its rejection by the scientific community?
Which feature of Wegener’s idea of continental drift contributed to its rejection by the scientific community? Wegener proposed
that gravitational forces from the Sun and Moon could move continents
. You just studied 44 terms!
What are the 4 types of plate tectonics?
- Divergent: extensional; the plates move apart. Spreading ridges, basin-range.
- Convergent: compressional; plates move toward each other. Includes: Subduction zones and mountain building.
- Transform: shearing; plates slide past each other. Strike-slip motion.
What are the 3 theories of plate tectonics?
The three types of plate boundaries are
divergent, convergent, and transform
. They are described in the following three concepts. Most geological activity takes place at plate boundaries.
Why do you think some rock layers are missing from the sequence in some outcrops?
193 Page 4 DISCUSSION QUESTIONS: (Answer in Conpleie Sentences) 1. Explain why some rock layers can be missing from the sequence in some outcrops.
They were weathered and eroded or never deposited
. reconstruct a sequence of events?
Which rock layer is the oldest?
The bottom layer of rock
forms first, which means it is oldest. Each layer above that is younger, and the top layer is youngest of all.
Did the Grand Canyon used to be an ocean?
An ocean started to return to the Grand Canyon area from the west about 550 million years ago
. As its shoreline moved east, the ocean began to concurrently deposit the three formations of the Tonto Group.
Is often paraphrased as the present is the key to the past?
One of the underlying principles of geology is the so-called
Principle of Uniformitarianism
which is often paraphrased as the present is the key to the past. If you want to study a ancient delta you could begin with a study of a modern one.
What are the two sources of energy for the earth system?
The earth is a vast, complex system powered by two sources of energy:
an internal source (the decay of radioactive elements in the geosphere, which generates geothermal heat)
and an external source (the solar radiation received from the Sun); the vast majority of the energy in the earth system comes from the Sun.
Why do things like stars and the sun and moon move across our sky quizlet?
12 regions of sky through which the Sun, Moon, and planets move as seen from Earth. The nightly motion of objects across our the sky is caused by the: …
rotation of the whole celestial sphere of stars around the fixed Earth
.
What are the 4 evidence of continental drift?
The evidence for continental drift included
the fit of the continents; the distribution of ancient fossils, rocks, and mountain ranges; and the locations of ancient climatic zones
.
What are the 3 main pieces of evidence that support the theory of continental drift?
Alfred Wegener, in the first three decades of this century, and DuToit in the 1920s and 1930s gathered evidence that the continents had moved. They based their idea of continental drift on several lines of evidence:
fit of the continents, paleoclimate indicators, truncated geologic features, and fossils
.
Why was Pangea not accepted?
Despite having this geological and paleontological evidence, Wegener’s theory of continental drift was not accepted by the scientific community, because
his explanation of the driving forces behind continental movement
(which he said stemmed from the pulling force that created Earth’s equatorial bulge or the …
