Why can crevasses in glaciers only be 50 meters deep?
a. plastic flow occurs below that depth.
b. glaciers cannot be thicker that 50 meters.
c. surges prevent plastic flow below that depth.
d. basal slip occurs below that depth.

Which principle states: "geologic processes taking place on earth today operated similarly in the past and can be used to explain past geologic events"? a. lateral continuity

Answer the above statement is ( false );

How is it possible that phylogenies based on sequences from nuclear genomes and organellar genomes (i.e., chloroplasts and mitochondria) from the same group of species yield phylogenetic trees with different branching orders?   answer :   the genome of the endosymbiont is more closely related to members of the group in which it originally evolved, while the nuclear genome of the engulfing organism has its own evolutionary trajectory.