Which ocean zone contains the remains of dead organisms and other matter that has settled to the ocean floor?

a - twilight zone

b - midnight zone

c - abyssal zone

d - neritic zone

C - Abyssal zone contains the remains of dead organisms and other matter that has settled to the ocean floor.

The abyssal zone is at the depth of 3000 m to 6000 m in the ocean and it makes up 83% of ocean. It also covers approximately 60% of the earth. There is no light in this zone which means lack of oxygen producing plants.  

Furthermore, organism die due to lack of oxygen if they roam this zone and end up on the seafloor. It is also rich in nutrients and minerals such as phosphorus, silica, nitrogen, and nutrients salts due to death of organic material in large amounts.

true. earthquakes are felt whenever there is a slip around a fault in the rocks below the earth. this reorientation of faults create sesmic waves and is known as earthquake, the severity of which is measured in richter scale. these are more prominent in hilly regions as the rocks usually form faults to balance the pressures on it.