The first estimate of the age of our planet was that of:

silt loam

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all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

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bioteacher101

answer; the code in musculoskeletal system subsection is associated with deep tissue possibly to the bone;

answer; ///(a) ;