Please help me ASAP.
How does speed/amount of mantle material rising and sinking, and the way that mantle material moves the plates affect a plate's speed?

convection currents i think

Explanation: hope this helps

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.

not sure if this is what you'r looking for nnew= nold