A. Clear Examples. The one on the top
Answer:
Because rocks in eastern North America are generally "older and colder" than those in the West: all else being equal, an M 7 earthquake that strikes on the east coast of the US would produce shaking that would be felt (C) over a greater area than a similar quake that occurred in the western US.
Explanation:
because the rocks are older they may not have the strength to withstand the vibration of the quake so it can be felt over a greater area.
An earthquake is simply the shaking of the earth surface that is being resulted from a sudden release of energy, in the lithosphere of the Earth and it then creates a seismic waves.
Earthquakes are generally caused when the rock underground suddenly breaks along a crack.
It is called headward Erosion!
The principle of superposition is that in a horizontally bedded sequence, the lower strata are the oldest and the top strata are the youngest. The sedimentary rocks were originally laid down horizontally so preserve features that are a consequence of this horizontality so if the strata have been uplifted and perhaps tilted say to vertical, using such clues as original graded bedding ie more coarse grained seds at the bottom of beds and progressively finer grained seds above them within a stratum, this is a clue as to what is up in a vertical or overturned sequence. Also, the fossil content will tell which strata are younger and which older.