The Earth's magnetic field. This is proven by measuring the magnetic orientation of the rocks as you move away from the Mid ocean Ridge.
It's Age! are you kidding me? Ha Ha I have the same stupid question on my science paper. the crossword right? its age!
Magnetic Strip, (Paleomagnetism).
As you move away from an ocean ridge, the rocks get older.
as you move away from an ocean ridge the rocks get older
How do rocks along the central valley of the mid ocean ridge provide evidence for sea floor spreading?
because the scientists found that the farther the rocks the older the rocks were. so the youngest rocks were found near the mid-ocean ridge. this showed that sea-floor spreading took place. +++ The primary evidence is "magnetic striping": remnant magnetising by the Earth's magnetic field of the iron compounds in the basalt forming the ocean floor. The magnetic traces are parallel to the spreading-ridges, and their polarity reflect the field's periodic reversal. The further from… Read More
false not the same
They are arranged in a pattern with magnetic strips having reversed polarities.
In a geomagnetic reversal, the south and north magnetic poles flip locations. A magnetic pole reversal takes place every 450,000 years on average, but this is not regular. We are way overdue since the last reversal was 780,000 years ago. There is a pattern in the magnetic polarity of basaltic rocks on opposite sides of a mid-ocean ridge. Basalt contains tiny magnetic crystals that point to the location of the north magnetic pole at the… Read More
The alignment of iron minerals in rocks when they are formed reflects the fact that Earth's has reversed itself several times in the past?
Magnetic alignment of rocks, in alternating strips that run parallel to ridges, indicates reversals in Earth's magnetic field and provides further evidence of seafloor spreading.
Periodically, the magnetic field of the earth reverses polarity. The direction of the magnetic field is recorded in the magnetic properties of rocks when they are erupted. Rocks are being continuously added at sea floor spreading regions, and thus the magnetic reversals are recorded as pairs of parallel 'stripes' alongside the mid ocean spreading ridge.
1.) The age of the rocks- the oldest ones are found further away from the original mid-atlantic ridge. 2.) Magnetic clues. The rocks with iron in them have shown that the Earth's magnetic field has reversed itself several times. It is imprinted in the rock.
Which statement provides evidence that the seafloor is spreading out from both sides of the Mid-Atlantic Ridge?
parrell strips of igneous rocks on each side of the ridge show matching reversal of magnetic polity
The magnetic properties of rocks along the mid-oceanic ridges change alignment in a symmetrical manner.
The alignment of iron-bearing minerals in rocks when they formed reflects the fact that earth's what has reversed itself several times in its past?
The alignment of iron-bearing minerals in rocks when they formed reflects the fact that Earth's has reversed itself several times in its past?
magnetic field .
How do rocks along the central valley of the mid-ocean ridge provide evidence of the sea-floor spreading?
Magnetic field direction.
Iron minerals that are present in magma or lava along the ridge that has not completely crystallized into rock are aligned with the Earth's polarity. When the magma or lava cools and solidifies completely, the magnetic orientation of the Earth at that time is preserved in the body of igneous rock.
Does the magnetic alignment in rocks on the ocean floor always runs from the north pole to the south pole?
Yes, because if it was going south to north is would be going backwards.
By observing magnetic rocks in geological deposits. By observing magnetic rocks in geological deposits. By observing magnetic rocks in geological deposits. By observing magnetic rocks in geological deposits.
Schists are metamorphic rocks with parallel alignment of minerals.
rocks with magnetic fields that point south have
The youngest rocks in the mid-atlantic ridge would be the newest to have cooled from the magma.
The oldest rocks are found farthest from the Mid Ocean Ridge
How old are the rocks of the east coast of north America relative to the rocks right along the mid Atlantic ridge why do you think this is the case?
I assume you mean the igneous/metamorphic basement rocks along the east coast, which are older than the rocks along the mid Atlantic ridge. This is becuase the rocks along the coast were formed from the same process that is producing the new rocks along the mid Atlantic ridge now, but were formed longer ago when the ridge was just forming.
cuz rocks come up from the ridge and create land by the ridge
Before discovering that rocks are imprinted with the direction of magnetic orientation that exists at the time of their creation, no proof existed to confirm Wegener's hypothesis. When rocks were examined from both sides of the Mid-Ocean Ridge, the magnetic orientations were found to be mirror images of each other, indicating that the seafloor was spreading outward, and therefore pushing the continents apart.
On each side of the mid-ocean ridge is a mirror of the striped pattern on the other side. When drawn, these patterns show alternating bands of normal and reverse polarity that match the geomagnetic reversal time scale, scientists can assign ages to the sea-floor rocks. The youngest rocks were at the center, and the older rocks father away. The ages of the sea floor rocks are symmetrical. The only place on the ocean-floor where new… Read More
In hot Iron bearing rocks or magmas the iron minerals they contain align themselves parallel to the Earth's magnetic field. When they cool below about 500 degrees Celsius the the iron minerals 'freeze' in this magnetic orientation and are no longer able to adapt to any changes in the Earth's field (which occasionally reverses polarity and wanders). This frozen magnetic alignment is a fossil of the ancient magnetic field and can be 'read' to find… Read More
Usually, magnetic rocks look magnetic, as one may think. They are a dark gray or silver, and most likely have a metallic luster. Magnetic minerals are the same.
The orientation of a rocks magnetic field can tell you it's relative age.
MOST rocks are nonmagnetic. Rocks with a very high iron content will be magnetic. One type of rock, known as lodestone, IS a magnet.
As rocks cool past the curie point, they tend to become magnetized in the direction that the earths field is point at that time. The earths magnetic field has reversed many times in the past. The mid ocean ridge is a place where the plates are spreading apart and new hot material is welling up. This makes stripes of rocks that are magnetized in alternating directions.
Sometimes. The sediments themselves cannot be dated by radiometric methods, because the radiometric dates will reflect the original formation of the rocks from which the sediments were derived. But the sedimentary rocks may contain datable material, such a fossils of a characteristic form, or there may be a datable layer of volcanic material above or between sedimentary layers. Also, it is sometimes possible to determine the age of rocks by comparing the alignment of magnetic… Read More
Although Lodestone is a naturally occurring magnetic rock, not all magnetic rocks are known as lodestone, and it is only magnetized because of the magnetite mineral in it.
When rocks are formed, usually from lava flows, the magnetic orientation of them is set as they solidify. As these rocks are affected by continental drift and other factors such as earthquakes, the original magnetic orientation remains. Using the known strengths of the earth's magnetic field over time, it is possible to then tell where these rocks originally emerged.
As one moves farther away from an ocean ridge, the age of the rocks and the seafloor increases. This process is called seafloor spreading.
The youngest rock found in the ocean ridge is called a hot rocks. They are formed when oceanic plates diverge are separate from each other.
If you know how many stripes away from the mid-ocean ridge the rock is and you know how frequently the earth's poles flip you can use the stripes like rings on a tree to measure the age of that rock.
Many rocks have magnetic properties (are capable of being magnetized, are magnetic or are attracted by a magnet) derived from magnetic minerals in their composition like magnetite, hematite, and ilmenite. The most well known magnetic rock is the lodestone, which is comprised mainly of magnetite.
They may contain naturally occurring magnetic minerals.
no, only iron, cobalt, nickel and their alloys are magnetic.
The rocks on the Mid Atlantic Ridge are among the youngest. The moment the magma that is being produced there cools enough to solidify, it becomes an igneous rock.
the ages of the rocks become increasingly older in samples obtained farther from the ridge and the younger had just come out the ridge.
By using a magnetometre or by testing them with a fixed magnet. Magnetic rocks tend to be igneous so look in volcanic areas.
The youngest rocks are found near a mid-ocean ridge.
They have the electromagnetic force in which two objects are attracted to one another in a specific field or range. It happens usually when the rocks contain iron which is the most important magnetic material.
Andrew T. Barsotti has written: 'Structural and paleomagnetic analysis of eastern Umtanum Ridge, south-central Washington' -- subject(s): Geology, Structural, Magnetic properties, Paleomagnetism, Rocks, Structural Geology
rocks found at the ridge