Table of Contents
- 1 How much is the density of mantle?
- 2 What is the relative density of the upper mantle?
- 3 What is the relative density of the lower mantle?
- 4 Is the mantle denser than the crust?
- 5 What is the stiffer mantle?
- 6 What happens to the temperature and density of the mantle material near the core?
- 7 What is the density of the oceanic crust?
- 8 How thick is the mantle?
- 9 What area of the Earths mantle is the densest?
- 10 What are some interesting facts about the Earth’s mantle?
How much is the density of mantle?
The mantle has a density of 4.5 g/cm3, and temperatures in the range of 1000-1500 oC. The uppermost layer of the mantle is more rigid, while the deeper regions are fluid, and it is the motion of fluid materials in the mantle that is responsible for plate tectonics (see section 4.3).
What is the relative density of the upper mantle?
Structure of the Earth
| Thickness (km) | Density (g/cm3) | |
|---|---|---|
| Crust | 30 | 2.2 |
| Upper mantle | 720 | 3.4 |
| Lower mantle | 2,171 | 4.4 |
| Outer core | 2,259 | 9.9 |
What is the relative density of the lower mantle?
Mantle is comprised of silicate minerals (Si, O) that are rich in iron and magnesium. Mean density of mantle is 4.5 g/cc.
What is the relative density of the Earth’s crust?
The average density of continental crust is about 2.83 g/cm3, less dense than the ultramafic material that makes up the mantle, which has a density of around 3.3 g/cm3. Continental crust is also less dense than oceanic crust, whose density is about 2.9 g/cm3.
Where is the density of the mantle greater?
Answer: The density is greater at point C. At point C the magma si cooling, as the magma cools the particles move slower and the density increases and gravity pulls the magma back towards the core.
Is the mantle denser than the crust?
The mantle, which contains more iron, magnesium, and calcium than the crust, is hotter and denser because temperature and pressure inside the Earth increase with depth.
What is the stiffer mantle?
the upper layer of the earth’s mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur. THE STIFFER MANTLE IS MOSTLY SOLID, THICK LAYER OF THE EARTH.
What happens to the temperature and density of the mantle material near the core?
As the core heats the bottom layer of mantle material, particles move more rapidly, decreasing its density and causing it to rise. The material cools because it is no longer near the core. It eventually becomes cool and dense enough to sink back down into the mantle.
Where is the temperature of the mantle material greater A or B?
Where is the temperature of the mantle material greater, at point A or point B? Explain why. Temperature is greater at point A because it is closer to center of the Earth. Also, this is where the rock of the mantle gets hot enough to rise up towards point B, due to a change in temperature and density.
What is the composition of the mantle?
The rocks that make up Earth’s mantle are mostly silicates—a wide variety of compounds that share a silicon and oxygen structure. Common silicates found in the mantle include olivine, garnet, and pyroxene. The other major type of rock found in the mantle is magnesium oxide.
What is the density of the oceanic crust?
The estimated average density of the oceanic crust is 2.86 + 0.03 Mg m -3.
How thick is the mantle?
about 2,900 kilometers
The mantle is about 2,900 kilometers (1,802 miles) thick, and makes up a whopping 84% of Earth’s total volume.
What area of the Earths mantle is the densest?
The asthenosphere is the denser, weaker layer beneath the lithospheric mantle. It lies between about 100 kilometers (62 miles) and 410 kilometers (255 miles) beneath Earth’s surface. The temperature and pressure of the asthenosphere are so high that rocks soften and partly melt, becoming semi-molten.
How thick is the Earth’s mantle?
The Earth’s mantle is a roughly 1,800 mile (2,900 km) thick shell of compressed and heated rock, beginning below the Earth’s crust ( lithosphere ), which extends 3.1 miles (5 km) below the ocean floor and 19 to 31 miles (30 to 50 km) below the continents. It makes up 70% of Earth’s volume,…
What is the percent of the thickness of the mantle?
The Earth’s mantle is a layer of silicate rock between the crust and the outer core. Its mass of 4.01 × 10 24 kg is 67% the mass of the Earth. It has a thickness of 2,900 kilometres (1,800 mi) making up about 84% of Earth’s volume. It is predominantly solid but in geological time it behaves as a viscous fluid.
What are some interesting facts about the Earth’s mantle?
6 Fascinating Facts About the Earth’s Mantle Earth has the same recipe of elements as the Sun and the other planets (ignoring hydrogen and helium, which have escaped Earth’s gravity). The top part of the mantle is slowly stirred by the plate motions occurring above it. This is caused by two types of activity. Our most powerful technique for exploring the mantle is monitoring seismic waves from the world’s earthquakes.