Which of the following is the main reason the Earth has a magnetic field?
On Earth, flowing of liquid metal in the outer core of the planet generates electric currents. The rotation of Earth on its axis causes these electric currents to form a magnetic field which extends around the planet.
How is it that the ocean floor is so much younger than the ocean itself?
How is it that the ocean floor is so much younger than the ocean itself? –Radioactive age-dating techniques are still uncertain. -The ocean floor keeps regenerating itself. -The sediment that is deposited on top of the ocean floor is so young.
What happens when an oceanic and a continental plate converge quizlet?
What happens when an oceanic and a continental plate converge? The oceanic plate will be subducted. What happens when two continental plates converge? Neither subducts; instead, a mountain range forms.
Who was the first person to advance the idea of mobile continents or continental drift?
The first person to advance the idea of mobile continents or continental drift was: Alfred Wegener.
Which of the following was the idea of scientist about an Earth’s magnetic field made of?
Earth's core and the geodynamo. The Earth's magnetic field is believed to be generated by electric currents in the conductive iron alloys of its core, created by convection currents due to heat escaping from the core.
Which of the following is not supposed to be the cause of Earths magnetic field?
(b)Earth's core contains molten iron. This form of iron is not ferromagnetic. Hence, this is not considered as a source of earth's magnetism.
How do the parallel magnetic stripes near mid-ocean ridges form?
At the mid-ocean ridge spreading axis, these flips in the direction of the Earth's magnetic field are recorded in the magnetization of the lava. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.
How do strips of magnetized rock on the ocean floor provide evidence of sea floor spreading?
How do strips of magnetized rock on the ocean floor provide evidence of sea-floor spreading? Strips of ocean-floor basalt record the polarity of Earth's magnetic field at the time the rock formed. These strips form a pattern that is the same on both sides of the mid-ocean ridge.
Which of the following are found at convergent plate boundaries involving ocean crust on both plates quizlet?
Which of the following features are found at an oceanic-continental convergent plate boundary? A continental arc, mountains, and trench.
What happens at a convergent plate boundary when an oceanic plate collides with an oceanic plate?
Ocean-Ocean Convergence Two oceanic plates may collide. In this case, the older plate is denser. This plate subducts beneath the younger plate. As the subducting plate is pushed deeper into the mantle, it melts.
What was Wegener’s evidence for his theory?
Wegener supported his theory by demonstrating the biological and geological similarities between continents. South America and Africa contain fossils of animals found only on those two continents, with corresponding geographic ranges.
Which of the following is not evidence used by Wegener in his hypothesis of continental drift?
Wegener's continental drift hypothesis did not give a plausible explanation for how continents move. Wegener's continental drift hypothesis did not state that the continents were arranged into a supercontinent many millions of years ago.
What did William Gilbert find out about the Earth’s magnetic field?
Lived 1544 – 1603. A forceful advocate of the power of the scientific experiment, Gilbert discovered that our planet has two magnetic poles; he defined these poles correctly and established that the earth behaves like a giant magnet.
Who was the first to realize that the Earth’s magnetic field is caused by the Earth’s interior?
Then in 1600 William Gilbert published De Magnete, in which he concluded that the earth behaved as a giant magnet.
What if Earth had no magnetic field?
If Earth lost its magnetic field, there would be no magnetosphere – and no line of defense, even from weaker solar storms. Our power grids would be more vulnerable than ever, and even our computers and other electronics could suffer damage if a solar storm struck.
What is magnetic polarity How does the oceanic crust record the polarity?
When lava is extruded at any mid-ocean ridge, the rock it forms becomes magnetized and acquires the magnetic polarity that exists at the time the lava cools. As the crust moves away from mid-ocean ridges, it contains a continuous record of the Earth's changing magnetic polarity.
How are alternating bands magnetic polarity formed?
At the mid-ocean ridge spreading axis, these flips in the direction of the Earth's magnetic field are recorded in the magnetization of the lava. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.
Why are the magnetic stripes on the sea floor parallel to and symmetrical across the mid-ocean ridge?
At the mid-ocean ridge spreading axis, these flips in the direction of the Earth's magnetic field are recorded in the magnetization of the lava. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.
When molten material cool and form strip of solid rocks in the center of the ridge?
At the mid-ocean ridge, molten material rises from the asthenosphere/mantle and erupts. The molten material then spreads out, pushing older rock to both sides of the ridge. As the molten material cools, it forms a strip of solid rock in the center of the ridge.
Which of the following statements by Alfred Wegener led to the ultimate rejection of continental drift as a hypothesis about continental movement?
Which of the following statements by Alfred Wegener led to the ultimate rejection of continental drift as a hypothesis about continental movement? Wegener suggested that the continents broke through thinner oceanic crust as they migrated over time.
When oceanic crust is pulled beneath a continent during a tectonic collision ie subduction you usually see the formation of?
A continental volcanic arc forms when oceanic crust is subducted under continental crust and a line of volcanoes forms on the continent as a result.
Which plate boundary and movement commonly create non volcanic mountains explain how non volcanic mountains are created by plate tectonics?
Answer and Explanation: The convergent boundary is one where the impact of the two plates towards one another results in the formation of non-volcanic mountains.
When oceanic crust meets oceanic crust along a convergent boundary which plate is to be subducted?
denser plate If the two plates that meet at a convergent plate boundary both are of oceanic crust, the older, denser plate will subduct beneath the less dense plate.
What was Wegener’s evidence for continental drift quizlet?
The Theory of Continental Drift was proposed by Alfred Wegener in 1912. He used several pieces of evidence to support his theory including fossils, rocks, glacial markings, coal deposits and the fact that the continents fit together like a jigsaw puzzle. .
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!
Was William Gilbert married?
He never married, and he gave up his own ghost just months after her death in 1603. De Magnete is a powerful work. Gilbert honed the new logic of experimental reasoning.
Who said Earth is a magnet?
Then in 1600 William Gilbert published De Magnete, in which he concluded that the earth behaved as a giant magnet.
Where is the magnetic North Pole 2021?
It was situated at 83°06′N 117°48′W in 2005. In 2009, while still situated within the Canadian Arctic at 84°54′N 131°00′W, it was moving toward Russia at between 55 and 60 km (34 and 37 mi) per year. As of 2021, the pole is projected to have moved beyond the Canadian Arctic to86.400°N 156.786°E.
How much does the Earth cost?
In fact, according to one astrophysicist who came up with a calculation for valuing planets, Earth is worth a bank-breaking $5 quadrillion dollars, unsurprisingly the priciest in the solar-system.
Is Earth losing its atmosphere?
A pair of researchers from Toho University and NASA Nexus for Exoplanet System Science has found evidence, via simulation, that Earth will lose its oxygen-rich atmosphere in approximately 1 billion years.