Of course, if the dose is too high, intoxication results. The trick is to find the right stimulant and the correct dose. So, doctors treat ADHD by prescribing various candidate drugs, noting results and adjusting dosage until a patient shows the desired improvement. When a child is out of control in the classroom, a very destructive cycle of disapproval and rebellion ensues.
Plastic and synthetic materials are the most common types of debris in our oceans and are having horrific impacts on marine wildlife and systems. As an island continent girt by sea marine debris is of particular importance for Australia.
B. Biogenic sediments-Sediments in which the grains are formed by the action of a living organism. Shells, tests, and other hard parts secreted by organisms that fall to the bottom of the ocean and slowly accumulate. When the biogenic component makes up more than 30% of the sediment the sediment is called an ooze.. The thickest accumulations of sediments in the world are in the oceans. All but 8% of the world's sediment is in the ocean in piles up to 9 km thick. The thickest accumulation are on the continental slopes and rises.