somethird of Earth s mass. is a region of hot.slow-flowing, solid rock between the core and the crust. 2. The __ Conclusion Questions: 1. The __ 3. The __ is the outermost rigid layer of Earth.

## Step 1<br />The first blank in the problem refers to a region of Earth that is described as a region of hot, slow-flowing, solid rock between the core and the crust. This description fits the definition of the Earth's mantle.<br /><br />## Step 2<br />The second blank in the problem refers to the outermost rigid layer of Earth. This is the definition of the Earth's crust.