The asthenosphere occupies a majority of the mantle. t. f.

False

Explanation:

The total depth of mantle is 1800 to 2900 kilometers. Mantle accounts for 80% of the total earth and Iit is made up of two layers – lithosphere and Asthenosphere. Asthenosphere lies at the depth of 80 and 200 kilometers which is just 4.4% to 6.89 % of the total depth of mantle. From this it can be visualized than asthenosphere do not constitute even half of the mantle and therefore the statement “The asthenosphere occupies a majority of the mantle” is false