Steps. 1  1. Perform major pruning during the dormant season. The ideal time to prune a crabapple tree is late winter or in the cold days of early spring, before leaves appear. 2  2. Remove suckers. Suckers are additional branches that begin growing underground and sprout near the base of the tree. 3  3. Remove water sprouts.
The upper crust is 12.5 km thick in crust with an average total thickness of 40 km (ref. 3). If the upper crust is the product of 14% melting, the corresponding residue would be 77 km thick, resulting in a total crustal thickness of 100 km, including the middle crust.
About 95 % of all seismic measurements indicate continental crust 22 km to 57 km thick, with the most typical values of about 35â45 km. The mean thickness of continental crust is 39.2 km Â± 8.5 km. The average (weighted by area) crustal thickness on the continents was recently estimated to be 41 km.