Lithosphere — Science definition

Defined in 2 courses:

Where it is taught

In use

The rigid, brittle outer shell (the crust plus the very top of the mantle) is called the lithosphere, and it is the layer broken into the giant moving slabs we call tectonic plates.

Earth's Internal Structure

Questions using lithosphere

Problem 1

Why should crust and lithosphere not be interchangeable?
Answer and explanation

Lithosphere includes crust plus rigid uppermost mantle. The categories use different criteria and boundaries.

Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.

Problem 2

Which statement correctly uses lithosphere in Inside Earth: Layers & Indirect Evidence?
  1. The entire mantle is a liquid ocean.
  2. lithosphere: The rigid outer layer including the crust and uppermost mantle.
  3. The crust and the whole lithosphere are identical layers.
  4. One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation

lithosphere: The rigid outer layer including the crust and uppermost mantle.

The rigid outer layer including the crust and uppermost mantle. B preserves the accepted basic state distinction: mostly solid mantle, liquid outer core, solid inner core. Slow mantle flow does not imply a liquid ocean. Seismic patterns and other evidence help infer these states, while a simple cutaway cannot provide exact thickness or composition at every point. Lithosphere and crust also should not be confused.

Problem 3

A student labels crust, mantle and lithosphere as three separate non-overlapping compositional layers and calls slow mantle convection proof of liquid rock. Correct both statements.
Answer and explanation

Lithosphere is a mechanical layer including crust and rigid uppermost mantle, so it overlaps compositional categories. Most mantle is solid and can deform slowly under sustained stress; convection does not establish liquid state.

Lithosphere is a mechanical layer including crust and rigid uppermost mantle, so it overlaps compositional categories. Most mantle is solid and can deform slowly under sustained stress; convection does not establish liquid state.

Response criteria

  • Use the stated measurements or conditions, with correct units.
  • Connect the result to the physical mechanism or evidence relationship.
  • Identify the assumption, model limit or further evidence requested.

Problem 4

Independent chapter check: A student labels crust, mantle and lithosphere as three separate non-overlapping compositional layers and calls slow mantle convection proof of liquid rock. Correct both statements.
Answer and explanation

Lithosphere is a mechanical layer including crust and rigid uppermost mantle, so it overlaps compositional categories. Most mantle is solid and can deform slowly under sustained stress; convection does not establish liquid state.

Lithosphere is a mechanical layer including crust and rigid uppermost mantle, so it overlaps compositional categories. Most mantle is solid and can deform slowly under sustained stress; convection does not establish liquid state.

Response criteria

  • Use the stated measurements or conditions, with correct units.
  • Connect the result to the physical mechanism or evidence relationship.
  • Identify the assumption, model limit or further evidence requested.

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