What is the concentration of hydronium ions and hydroxide ions

The footprints of a dinosaur and the burrow of an ancient shrimp are examples of which kind of fossils

Chemical engineering who specializes in negotiating for large purchases and instructing customers in use of the products are

In chile, the deepest earthquake occurred at 61.7°w longitude at a depth of 540 km. if the rocks at the focus began subducting 10 million years ago and are now 1000 km from their original position, what is the average rate of subduction in cm/yr?