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 a common condition affecting both boys and men it occurs more often in men who have not been circumcised symptoms can include redness swelling and soreness around the head of the penis or foreskin a thick discharge under the foreskina rash on the penis itchiness an unpleasant odourpain when urinatingalanitis is a common condition affecting both boys and men it occurs more often in men who have not been circumcised symptoms can include redness swelling and soreness around the head of the penis or foreskin a thick discharge under the foreskin