New seafloor material is formed at places in Earth's crust where 1. Rock is broken into pieces as tectonic plates push against one another

2. One tectonic plate slides beneath and is forced downward

3. Lave flow from volcano eruptions builds up over many thousands of years

4. Magma rises into the spaces where tectonic plates pull away from one another

One tectonic plate slides beneath and is forced downward

a metamorphic rock would be formed.

osteogenesis imperfecta (oi) refers to a congenital ailment of bones. in the condition, the bones become brittle or fragile. this ailment is a general result of the defect or mutations in the genes (colia1 or colia2). this mutation results in imperfect collagen formation either in quantity or quality wise.  

there are eight kinds of oi defects, and each kind varies with certain distinctions in symptoms. the usual symptoms include frequent bone fractures, loss of hearing in infants, protruding eyes, discoloration of the white in the eyes, respiratory issues, loosening of the joints, short stature, and other symptoms.