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The magnetism in basaltic rock on the ocean floor suggests that the continents have been moving away from each other. The earth regularly undergoes magnetic shifts in which north becomes south and vice versa. As the magma rising through the diverging ocean floor cools into basaltic rock, it takes on the magnetic properties of the earth at that moment. In this way we can tell which way the continents are moving and that they were likely joined in the past. On top of this, the general shape of the continents also suggests this supercontinent as well as the distribution of species.

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โˆ™ 2011-05-26 06:53:32
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Q: How magnetism in rocks suggest that the continents were once joined?
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Is paleomagnetism the study of ancient magnetism?

Paleomagnetism is the study of the magnetism of ancient rocks. In principle, it was the study of ancient magnetism


How can you see magnetism in rocks?

Magnetic rocks have varying degrees of power. The magnetism could be visible by its pull on a few iron filings, or in the fact that it picks them all up.


Is magnetism a rock?

No. It is not a rock. However there are rocks that are magnetic, have magnetism. Magnetism is one-half of the fundamental force called electro-magnetism. That's why we can cause some things to move using magnets.


How are seafloor spreading and continental drift supported by paleomagnetic data?

When a rock is formed, rocks have a preserved imprint of the changes in the earths magnetism over the eons of geological time thus shows that the continents are drifiting.


What is the study of the past magnetism in rocks known as?

This is known as paleomagnetism.


What evidence is there that the continents were once connected?

The continent pieces fit together as if they where a puzzle. If you look at South America and Africa it seems that they could have once been connected.Fossil evidence in different countries implies that they may have once been joined. The fossils of large birds are the same implying that there was a common ancestor to large flightless modern birds that are separated on different continents.Mid ocean ridges are spreading the ocean floors apart. The age of the rocks on the bottom of the ocean shows that the plates that the continents are on are moving apart.Finally, the most compelling evidence is to do with the magnetism of the rocks. As the lava cools the ferromagnetic material in some rocks lines up with the Earth's magnetic poles. When these rocks move they are no longer lined up to the Earth's current magnetic poles, they produce anomalies in the magnetic readings. These rocks reveal their latitude of where they were when they cooled.


Explain how looking at the magnetism of certain rocks helps support the idea that the continents have moved and changed over time?

Most of the the rocks on the edge of the continent all match equally, and some rocks are magnetic North and others are magnetic South. However; this fact only proves that the Earth's landmasses have changed over time.


How are rocks near continents different from rocks found near centers of seafloor spreading?

Rocks near continents(on the margins of oceanic basins) are generally older and rocks near a center of sea floor spreading are younger


What kind of rocks are the continents made of?

GRANITE is the answer.


Two meanings of lithosphere?

Continents and Rocks.


How do rocks get energy?

Through light, gravity, velocity, and magnetism to name a few.


What are rocks that exhibit magnetism that is opposite to the current magnetic field?

magnetic fields


Title page for rocks and rock cycles?

rocks are usually joined minerals.


Sedimentary rocks with ripple marks suggest that the rocks form?

rippled rocks


The oldest rocks on the seafloor are much younger than the oldest rocks on the continents?

true


How would the age of the oldest rocks on the continents compare with the age of the oldest rocks on the seafloor if the rock on the continents is continually formed but not removed?

The oldest rocks on the continents would be much older than the rocks on the sea floor because the rocks on the continents are not being removed unlike the rocks on the sea floor that are made by the mid-ocean ridge are being removed by deep ocean trenches. this prossess that is occuring on the sea floor is called sea floor spreading. evidence of this is the Pacific ocean shrinking and the Atlantic ocean growing.


How would present day animals and rocks on different continents compare since the continents have been separated for a long time?

Present day and animals and rocks on different continents compare the been separated for a long time by scientist examines rocks to find out about earth's history and structure


How are aceans different from continents?

Oceans are made out of sea water, and continents are made out of land; dirt and rocks. Oceans are liquids, continents are solids.


What mineral forms most of the earth's crust under continents?

It's the geological rocks such as igneous rocks and metamorphic rocks.


Why was there no trace of magnetism in the rocks of Hellas and Argyre on Mars?

Magnetic minerals were not formed at the surface


What evidence did exploration of the ocean floor reveal to further support wegeners theory?

Exploration of the ocean floor supported Wagner's tectonic plate theory because of the shapes and rocks found on the ocean floor. The shapes and rocks suggested that the continents had indeed once been joined.


When rocks from cooling lava harden do they have the same magnetism as Earth's magnetism?

No, because Earth's magnetism "flips" about every half million years. When rock form from the cooling lava of volcanoes, the particular magnetic pattern at the time is "frozen" into the rocks. This was evidence that the alternating pattern of the rock has been slowly spreading out as the new crust is formed.


Where are most sedimentary rocks found on continents formed?

UNDERWATER


What crustal rocks found beneath the continents?

continental crust


Which is older rocks found on the ocean floor or rocks found on continents?

It depends on where on the continents compared to where on the ocean floor. Generally speaking, interior continent areas display rocks of greater age than one would find on the ocean floor.