Where do P waves travel fastest quizlet?
Terms in this set (21) P-WAVES travel fastest through rock . P-waves can travel in any kind of material( liquid , solid). S waves travel slower through rock S-waves cannot travel through the outer core – it’s liquid!
Why do we believe Earth’s outer core is a liquid quizlet?
Seismic waves move along curved ray paths because of changing properties of rocks. Why do we believe Earth’s outer core is a liquid? S waves do not travel through the outer core. P waves slow down and refract at the boundary between the mantle and the outer core.
How do we know the outer core is liquid quizlet?
Because the asthenosphere is composed of weak, hot, and dense rock, the cold, rigid, and less dense lithospheric plates are capable of moving on it. How do we know that the outer core of Earth is liquid? -When the iron melting curve is to the left of the geotherm, rocks are molten.
How do seismic waves tell us the Earth’s outer core is liquid quizlet?
The different densities of earth’s layers cause seismic waves to be reflected or refracted (bent.) S-waves disappear at the mantle core boundary, so we know the outer core is liquid.
What is the evidence that Earth’s outer core is liquid?
Evidence for a fluid outer core includes seismology which shows that seismic shear-waves are not transmitted through the outer core. Because of its high temperature, modeling work has shown that the outer core is a low-viscosity fluid that convects turbulently.
What is Earth’s outer core made out of?
The outer core, about 2,200 kilometers (1,367 miles) thick, is mostly composed of liquid iron and nickel. The NiFe alloy of the outer core is very hot, between 4,500° and 5,500° Celsius (8,132° and 9,932° Fahrenheit).
How does heat flow through Earth’s inner and outer cores?
Heat flows in two different ways within the Earth: Conduction: Heat is transferred through rapid collisions of atoms, which can only happen if the material is solid. Heat flows from warmer to cooler places until all are the same temperature. The mantle is hot mostly because of heat conducted from the core.
Which of the following statements best describes the outer core?
Earth’s outer core is a fluid layer about 2,400 km (1,500 mi) thick and composed of mostly iron and nickel that lies above Earth’s solid inner core and below its mantle. Its outer boundary lies 2,890 km (1,800 mi) beneath Earth’s surface. Unlike the inner (or solid) core, the outer core is liquid.
Who was the first person to tell about the core?
Danish seismologist Inge Lehmann (1888-1993) is best known for presenting the first evidence of the Earth’s inner core in 1936. Her active research career as a seismologist began in 1928, continued well into the 1970s, and earned her the reputation as “The Grande Dame” of modern seismology.
What is the best explanation why the inner core solid?
Metals such as iron are magnetic, but rock, which makes up the mantle and crust, is not. Scientists know that the outer core is liquid and the inner core is solid because: S-waves do not go through the outer core.