Respuesta :
Answer:
The theory of plate tectonics
Explanation:
Alfred Wegener, a geophysicist and meteorologist proposed the theory of continental drift to explain how the earths major land masses have moved through geologic time.
In 1912,Wegener through his rich collection of fossils was able to propound the theory of continental drift in which he stated that "continents were once joined together and they have moved to their present position today". His theory failed to identify the mechanism responsible for the drifting continents.
If a geologist finds fossils of marsupials from different continents and he correlates them to the same geologic time, the best explanation is from the view point of continental drifting as explained by Wegener's theory.
In present day, the theory has been widely replaced by the plate tectonics theory which combines reasoning from the view point of Continental drift and sea floor spreading. The theory of plate tectonics fits this problem properly.
Plate tectonics suggests that the earth's lithosphere is broken into plates which moves on top of the weak and ductile asthenosphere. During the early formative years of our planet, plates were joined together as one in a grand land mass known as Pangaea. Plate tectonics caused the lithosphere to break and move to their present positions.
Answer:
1) Geologists found fossils of similar marsupials from the same time period across South America, Africa, Antarctica, India and Australia. What theory is supported by this discovery?
Answer: Those continents were once a part of one supercontinent.
2) At which type of plate boundary would a string of small volcanic islands most likely form?
Answer: convergent ocean-ocean boundary
3) Which statement about earthquakes is accurate? Select the two correct answers.
Answers; Most earthquakes are not strong enough to be felt by humans. & About 100 earthquakes per year are strong enough to cause damage.
4) In 3–5 sentences, identify and describe the fossil evidence Wegener used to support the theories of continental drift and plate tectonics.(FIX)
ANSWER: (Similar fossils such as glossopteris and marsupials are found in these continents that indicates that the continents were attached together.The remains of the organisms such as Mesosaurus, Marsupials and fossilized plants glossopteris are commonly found in these continents, and were separated at various velocities. These fossils indicate the existence of the large supercontinent called Pangaea that got separated due to plate motion.) carful for plagerism try putting this in your own words.
5) Select the correct answers from the list.
Answers: Scientists wondered how volcanoes could be located so far from tectonic plate boundaries until one proposed the idea of 1(hotspots), where the magma is much hotter than the surrounding magma. These are 2(fixed) and do not move with tectonic plates. They are responsible for the creation of 3(volcanic) island chains.
6) In 3-5 sentences, describe how paleomagnetic evidence supports the theory that continents change position (drift) over time.(FIX)
ANSWER:(The earth magnetic field changes direction and its strength varies from year to year. This results in magnetic anomalies within a rock body as magnetic elements and minerals record the changing direction of the magnetic field. As new magma is brought near the mid-oceanic ridge, the older ones are pushed backwards and they show a different magnetic field direction from the cooling magma. This is usually evident in the orientation of the magnetic minerals.) Carful watch for plagerism!
7) Describe how plant fossils found at Svalbard in Norway gave evidence of drifting continents.
ANSWER: They were warm climate plants that would not grow in a cold polar area.
8) What main process do all volcanoes have in common, regardless of the specific ways they form?
ANSWER: rising magma
9) How were the Himalayas formed?
ANSWER: when two plates collided with each other
10) What will happen where two continental plates collide at a convergent boundary?
ANSWER: The plates push up, forming a mountain range.
11) Which information is needed to construct a geomagnetic time scale? Select the two correct answers.
ANSWERS: the age of rocks along the surface of Earth & the magnetic direction of rocks along the surface of Earth
12) Which statement describes a volcano that is classified as dormant?
ANSWER: It has not erupted recently.
13) Identify the type of plate boundary that created the volcanoes of Iceland.
ANSWER: a divergent boundary on land
14) Which features would you look for to classify a volcano? Select the three correct answers.
ANSWERS: height & steepness & type of lava
15) Mountain chains in Northern Europe and West Africa match the Appalachian Mountains in terms of their ages and the sequences of rock layers that make them up. In 3–5 sentences, analyze these observations, and explain what conclusions can be drawn from them. (FIX)
ANSWER:(The theory of plate tectonics combines the ideas behind the theories of continental drift and sea floor spreading. These terrains, west Africa, Europe and Appalachians must have been joined together as a single land mass where the same geologic mountain building process (progeny) produced the ranges. The plates then broke up and the continents moved to their present day positions.) Teachers check for plagiarism watch out!!!!
Explanation:
took test All 100% correct!
all the little writting promps suck... dont copy word for word
Teachers are crazy!!!
