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 swelling of the foreskin or head of the penis. According to the National Health Service UK, balanitis is a common condition that affects an estimated one in 20 males.It also accounts for one in 10 cases of visits to a sexual health clinic or urology clinic by adult men (NHS).alanitis is a condition that largely occurs in uncircumcised men. Balanitis can be a painful condition, but it isnât a serious one. It can usually be relieved using topical medication.