Osteoarthritis is by far the most common form of arthritis, affecting about 16 million Americans, while rheumatoid arthritis, which affects about 2.1 million Americans, is the most crippling form of the disease.
Most Abundant Metal in the Earthâs Crust. Aluminium â Itâs the most abundant metal in the Earthâs crust, yet it entirely escaped our notice until 1825. You might say it was hidden in plain sight. Aluminium is a highly reactive metal, meaning it readily undergoes chemical reactions with other elements and compounds to form different substances.
The five most abundant elements in Earth's crust by volume and listed here as a percentage of the total volume of the crust are:   # Oxygen--47%  # Silicon--28%  # Alum â¦ inum--8%  # Iron--5%  # Calcium--4%        . 62 people found this useful.Paul Jones. Rockhound.he most abundant element in the crust of Earth is oxygen; the most abundant metal is aluminum. The Earth's crust consists of the following elements and percentages: Oxygen- â¦ -47%Silicon--28%Aluminum--8%Iron--5%Calcium--4%Sodium--3%Potassium--3%Magnesium--2%Titanium--0.5%All others--. 9 people found this useful.