Which relationship describes the most common trend between Earth's multiple volcanic zones?
A Most of the volcanic zones on Earth are concentrated in the areas with colder climates.
B Most of the volcanic zones on Earth are concentrated in the Southern Hemisphere.
C Most of the volcanic zones on Earth are concentrated along plate boundaries.
D Most of the volcanic zones on Earth are concentrated along the Antarctic Plate.

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.

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.