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Why do Geologists think Earth’s core is mostly iron?
A. The iron-nickel alloy that composes the inner core is heavier than other elements in the mantle and outer core, causing it to sink to the center of earth. B. Since both iron and nickel and attracted to magnets earth’s magnetic field drew the to metals into the inner core mixing them into the alloy.
What is the evidence to support that Earth’s core is mostly iron?
Evidence from earthquake waves indicated that the outer core is liquid. The pressure in the center of the Earth is so high that the iron is in a solid state.
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Why is the inner core mostly iron?
However, unlike the outer core, the inner core is not liquid or even molten. The inner core’s intense pressure—the entire rest of the planet and its atmosphere—prevents the iron from melting. The pressure and density are simply too great for the iron atoms to move into a liquid state.
How do we know earth’s core is iron?
There are no samples of Earth’s core accessible for direct measurement, as there are for Earth’s mantle. Information about Earth’s core mostly comes from analysis of seismic waves and Earth’s magnetic field. The inner core is believed to be composed of an iron–nickel alloy with some other elements.
Why do geologists believe the inner core is solid quizlet?
Why do geologists believe the inner core is solid? P waves refract at the boundary between the outer core and inner core. How could you test whether the core of another planet were completely solid?
Which statement best explains why Earth’s core contains such high percentages of iron and nickel?
Which statement best explains why Earth’s core contains such high percentages of iron and nickel? When Earth was still molten, gravity pulled dense elements down to Earth’s center.
What evidence do we have that the Earth’s outer core is molten?
Seismic-Wave Data
Both P waves and S waves can travel through solids, but the only P waves can travel through liquids. Seismic wave data shows that S waves do not pass through the outer core, and thus this part of the planet’s interior must be liquid.
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Why is Earth’s core iron and not gold?
During the formation of the Earth, molten iron sank to its centre to make the core. This took with it the vast majority of the planet’s precious metals – such as gold and platinum. In fact, there are enough precious metals in the core to cover the entire surface of the Earth with a four metre thick layer.
How scientists have concluded that the core of the Earth is made up of mostly iron and nickel?
The outer and inner core are both composed mainly of iron. By measuring information from seismic waves, scientists can conclude that the iron in the outer core and inner core exist at different densities, so exist as different states of matter: liquid and solid.
How do geologists know that the mantle is mostly solid and not molten?
Most mantle studies are conducted by measuring the spread of shock waves from earthquakes, called seismic waves. The seismic waves measured in mantle studies are called body waves, because these waves travel through the body of the Earth. The velocity of body waves differs with density, temperature, and type of rock.
How do geologists know that the outer core of Earth is liquid?
By tracking seismic waves, scientists have learned what makes up the planet’s interior. P-waves slow down at the mantle core boundary, so we know the outer core is less rigid than the mantle. S-waves disappear at the mantle core boundary, so the outer core is liquid.
How do geologists study direct evidence of Earth’s interior Brainly?
Geologists study direct evidence of the earth’s interior by (b) measuring seismic wave activity. The earth’s interior is made up of a number of layers such as the crust, mantle, outer and inner cores.
Which statement best compares the theories of plate tectonics and continental drift?
Q. Which statement best compares the theories of plate tectonics and continental drift? Plate tectonics and continental drift are two names for the same theory. Plate tectonics proposes that the continents move; continental drift proposes the mechanism for how the continents move.
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What tectonic process created the Tibetan Himalayan mountains where India meets Eurasia?
This immense mountain range began to form between 40 and 50 million years ago, when two large landmasses, India and Eurasia, driven by plate movement, collided. Because both these continental landmasses have about the same rock density, one plate could not be subducted under the other.
What evidence best supports the plate tectonic theory?
Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed. Some life “rode” on diverging plates, became isolated, and evolved into new species.
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