Extending outwards from the core are the mantle and the crust. Earth's mantle extends to a depth of 2,890 km beneath the surface, making it the thickest layer of Earth. This layer is composed of silicate rocks that are rich in iron and magnesium relative to the overlying crust.
The Parasite: Balantidium coli. Balantidium coli is the only ciliate known to parasitize humans. Ciliates represent a phylum of protozoa characterized, in at least one stage of development, by simple or compound ciliary organelles on the surface of their membranes that are used for locomotion.
Balanitis is an inflammation of the foreskin and head of the penis that typically occurs in boys and men who are uncircumcised (foreskin remains around the penis).This inflammation can be caused by infections, poor hygiene, or irritants from soaps or detergents.alanitis usually occurs in boys and men who are not circumcised and still have their foreskin, the retractable covering of the penis. It is most commonly caused by poor hygiene practices. Fortunately, it can usually be prevented by thoroughly and regularly cleaning the shaft and foreskin of the penis.