Answer:c
Explanation: Population density is a measurement of population per unit area, or exceptionally unit volume; it is a quantity of type number density. It is frequently applied to living organisms, most of the time to humans.
They can use the north star to estimate their location in the ocean.
Bedrock structure is primarily responsible for landscape differences.
Bedrock lies beneath the surface materials such as soil,
gravel, sand and other sediments. It is a deposit of hard, consolidated,
tightly-bound solid rock. It is the parent material for unconsolidated material
and soil above thus influencing landscapes.
The erosion causes physical changes of the environment. This process is responsible for braking down rocks to smaller pieces, and even making them sandy over time. Once this is done, the erosion is slowly (occasionally in a sudden manner) is starting to remove layers of the surface of a particular place, and moving them to another place (which is the process of deposition), thus changing the physical appearance of the place. The erosion is process that has the tendency to flatten the natural features.
