Drifting

1. Fossil evidence: If they are to far apart
2. Fit of the continents: Fit very well at continental shelves
3. Rock and structural similarities: Rock on different continents match
4. Paleoclimate: To warm for ice
5. Paleomagnetism: Pieces point different ways

Wegner believed that the force causing continental drift was the movement of the continents through the Earth's crust, driven by the gravitational forces associated with the rotation of the Earth. This movement was theorized to be a result of the continents floating on the denser, underlying mantle layer.

A drift key is a specialized tool used to remove or install gears or shafts from equipment such as machinery or vehicles. It typically has a tapered end that allows it to fit into tight spaces and apply firm pressure for the task at hand. Drift keys are commonly used in mechanical and automotive industries.

Climate patterns and fossil evidence can help support continental drift theory. For example, matching rock formations and fossils across continents suggest they were once connected. Additionally, similarities in climate types and geological features between distant landmasses also provide evidence for past continental connections.

Alfred Wegener used several lines of evidence to support his theory of continental drift. This included the fit of the continents like a jigsaw puzzle, similarities in rock formations and mountain ranges across different continents, matching fossils on separate continents, and paleoclimatic evidence such as glacial striations in tropical regions. These pieces of evidence led Wegener to propose the theory of continental drift in the early 20th century.

Genetic drift is a random process that can lead to fluctuations in gene frequencies within a population over time. It is more prominent in smaller populations where chance events can have a bigger impact. Over generations, genetic drift can lead to the fixation of certain alleles and the loss of others, resulting in changes to the genetic makeup of a population.

the mechanism for continental drift was not well understood at the time, and there was no evidence to support the idea of continents moving. It wasn't until the theory of plate tectonics was developed that the idea of continental drift became widely accepted.

It is because he couldn't explain why or how the continent's drifted apart. They didn't believe him until after he died.

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More to the point, they didn't believe him until new techniques showed hitherto-hidden evidence.

The shapes of different coastlines can provide evidence for continental drift because some coastlines on different continents appear to fit together like pieces of a jigsaw puzzle. For example, the coastlines of South America and Africa have similar shapes and can be fitted together. This suggests that these continents were once joined together and later drifted apart.

The seafloor spreading hypothesis suggests that the primary cause of continental movement is the upwelling of magma at mid-ocean ridges, which creates new oceanic crust. The movement of this newly-formed crust pushes the existing seafloor apart, leading to the gradual separation and movement of the continents.

Evidence supporting the theory of continental drift includes the jigsaw-like fit of continents, similarities in rock formations and fossils across continents, and matching mountain belts on different continents. Additionally, the discovery of mid-ocean ridges and magnetic striping on the ocean floor provided further evidence for plate tectonics.

I believe his first observation was the way the continents of South America and Africa "fit" together like a jigsaw puzzle (although he was not the first to realize this). He also made note of fossil discoveries in Africa which corresponded to those in South America. Finally, he began his own research which actually alligned rock formation/componants from one side of the Atlantic with the other.

Natural Selection as you probably know, is the mechanism by which a species (or genetic makeup of a breeding group) changes in response to an environmental challenge. For example, imagine a population of brown rabbits in a field. They are happy, breeding and being eaten occasionally by foxes until over time, the environment changes so that the field is covered in snow.

Now, the brown rabbits stick out and the foxes have an easy time of hunting them. Consequently, the number of brown rabbits decreases dramatically and they are threatened with extinction. The genetic mutations always present in the population (and which increase with in-breeding in small populations) throw up random variations as always but now, some are more beneficial. For instance white rabbits which used to be caught and eaten quickly before the snow came, are now much better adapted. As such, they are more likely to survive, breed and pass on their white genetic make up and hence more white rabbits are born - they are naturally selected by the snow and the foxes; their environment.

GD is also a change in genetic make up of a population however it is not stimulated by the environment. Imagine our population of rabbits again. 50% of them have blue eyes and 50% have green. The eye colour makes little difference to their survival chances and is just a natural variation. A new born rabbit will statistically have a 50% chance of blue eyes and 50% chance of green eyes.

In a big population, the proportion of blue to green is likely to stay at or around 50%. However that is not the case in a small population.

Imagine there are now only 20 rabbits: 10 with blue eyes, 10 with green. Purely by chance, some of these rabbits will not breed, or some breed more often. Let's say - by chance - one green-eyed rabbit gets run over and doesn't breed. There are 10 blues and 9 greens. That means that there are now 53% blues and 47% greens. These proportions will now have a greater impact on the consequent generation since there are more blues, there will be a greater chance of blues appearing in the next generation and less chance of greens.

Populations like this constantly vary due to any number of random events. In small populations, those random events become more important since they represent a greater proportion of the total population.

In large populations, this drift is small and frequently reversed however in small populations it is almost inevitable that one of the two (or more) traits will eventually be lost from the population.

So with NS, a specific trait increases in the population because it is better adapted to the changed environment.

With GD, a specific trait increases in the population simply because a random event caused there to be slightly more of one and less of another leading to the more populous being more likely to breed

No, the Statue of Liberty is not moving backwards due to continental drift. The statue is firmly anchored to Liberty Island in New York Harbor and is not affected by the slow movement of tectonic plates that make up the Earth's crust.

Continental drift is influenced by tectonic plate movement. Over 200 million years, the continents may continue to drift apart as tectonic plates move at a rate of a few centimeters per year.Exact distances are difficult to predict due to uncertainties in plate movement and geological processes.

There is a phenomenon called 'magnetic banding' where rock preserves the orientation of the earth's magnetic field at the time it's created at constructive plate boundaries. The earth's magnetic field flips every so often in geological history, so we see bands of rock in the sea floor with alternating magnetic signatures. This indicates that the seafloor has spread and made new rock over time, and so the continents associated must have spread (and met in the middle at some point in the past.) Similarly, we see volcanism and earthquakes happen at destructive plate boundaries, suggesting plates are drifting and being pushed under one another, indicating that overall the plates are moving. Now we can put GPS markers all over the world and use satellites to accurately show how much certain plates have moved in a particular timeframe.

Rock types can provide evidence of continental drift by matching on opposite sides of current oceans, showing that the continents were once connected. For example, the Appalachian Mountains in North America align with the Caledonian Mountains in Scotland, indicating they were once part of the same mountain range before continental drift occurred. Additionally, similar fossils and rock formations found on different continents support the theory of continental drift.

Alfred Wegner thought that the continents had all been connected together at one point in time and when they were connected, they were in the center of the world. all the continents were toward the south pole and equator. his question: were all the continents the same temperature at one point during the earth's history? and his answer came back very clear. yes. have you realised a pattern in our weather? have you realised the mountains or landforms? have you noticed the fossils? these are all clues of Wegner's theory to be true!

Alfred Wegener, a German meteorologist and geophysicist, proposed the theory of continental drift in the early 20th century. He suggested that continents were once part of a single supercontinent called Pangaea and gradually drifted apart over time.

One type of evidence for continental drift is fossil evidence, such as plant and animal fossils that are found on separate continents but are closely related. Another type is geological evidence, including the matching of rock formations and mountain ranges on different continents, as well as the distribution of earthquakes and volcanoes along continental boundaries.

the three puzzling occurrences that helped to support the theory was when the southern tips of south american and Africa do not touch

2 they did not touch in the past

over time earths continents have changed shape and traveled great distances

i was looking at a wks in class on this but hey im in seventh grade so you can trust me or not on this but here u go

1. Fossil evidence: Similar fossils of extinct plants and animals have been found on continents that are now separated by vast oceans, such as the Mesosaurus found in both South America and Africa.
2. Rock formation evidence: Matching geological formations and mountain ranges are found on continents that were once connected, like the Appalachian Mountains in North America and the Caledonian Mountains in Scotland.

One key difference is that the continental drift hypothesis proposed that the continents moved through the oceanic crust, while plate tectonics theory explains the movement of large rigid plates that make up the Earth's lithosphere. Plate tectonics theory also includes the concept of seafloor spreading and subduction, which were not part of the original continental drift hypothesis.

When Alfred Wegener first proposed the theory of continental drift in the early 20th century, it was met with skepticism because he did not have a clear mechanism to explain how continents could move. Additionally, the scientific community at the time held onto the prevailing theory of stationary continents. It wasn't until the development of the theory of plate tectonics in the 1960s that Wegener's ideas gained more widespread acceptance.

Henry Hess proposed the theory of seafloor spreading, which suggests that new oceanic crust is formed at mid-ocean ridges and then moves away from the ridges, pushing older crust away. This process helps explain how continents can drift apart and shed light on the theory of plate tectonics.