Question

select the statement(s) that accurately describe the mantle. in the mantle, dense rock rises and less dense rock sinks, creating convection currents. the mantle makes up more than half of earths mass and volume. the mantle is the thickest layer of earth. the uppermost part of the mantle combined with the lower crust forms the lithosphere. convection currents in the mantle move tectonic plates in the lithosphere.

Explanation:

The mantle has convection currents due to density - differences in rocks (hotter, less - dense rock rises and cooler, denser rock sinks). The lithosphere is formed by the combination of the upper - most part of the mantle and the crust. The mantle is not the thickest layer (the core has a significant thickness too), and it does not make up more than half of Earth's mass and volume.

Answer:

In the mantle, dense rock rises and less dense rock sinks, creating convection currents.
The uppermost part of the mantle combined with the lower crust forms the lithosphere.
Convection currents in the mantle move tectonic plates in the lithosphere.