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What is the innermost layer of the mantle?

Terms in this set (11)

  • Asthenosphere. The layer immediately surrounding the lower mantle; composed of molten rock.
  • Core. Innermost layer of the earth; divided into inner and outer core.
  • Crust.
  • Geosphere.
  • Inner core.
  • Lithosphere.
  • Lower mantle.
  • Mantle.

What is the composition of the innermost layer?

The innermost layers of the Earth. The Earth has an outer core (liquid) and an inner core (solid). They are not chemically distinct from each other, but they are chemically distinct from the mantle. The core is mainly composed of nickel and iron.

What is Earth’s innermost section made of two layers?

The Earth’s core is divided into two layers, a solid inner core, and a liquid outer core. The Inner Core (D) (1216 km) is solid nickle-iron alloy. The Outer Core (C) (2270 km), is a molten nickle-iron alloy. The Mantle (B) is approximately 2885 kilometers thick and is the middle layer of the Earth.

In which layers can life survive?

Troposphere. At the bottom of the atmosphere, where most of the life on the surface exists, is the troposphere. The troposphere is the only atmospheric layer that can support life. The higher layers have filtered out the harmful radiation, and there are large amounts of water vapor.

Which gas is 78% of the atmosphere?

nitrogen

What is the pressure in the troposphere?

1000 to 200 millibars

Why are there layers in the atmosphere?

Different temperature gradients create different layers within the atmosphere. The troposphere is heated from the ground, so temperature decreases with altitude. Because warm air rises and cool air sinks, the troposphere is unstable. In the stratosphere, temperature increases with altitude.

Why mesosphere is the coldest layer?

The top of the mesosphere is the coldest part of the atmosphere. The air is much thinner (less dense) in the mesosphere than in the stratosphere below. There are fewer air molecules to absorb incoming electromagnetic radiation from the Sun.