upper mantle

The portion of the mantle lying above a depth of about 600 miles (1000 kilometers). Also known as outer mantle; peridotite shell.

Related terms:

• lower mantle
• Mantle
• core-and-mantle structure
• plasma mantle
• transition zone
• Lithosphere
• inner mantle
• outer mantle
• Mantle Plume
• upper mixing layer