How do oil traps keep oil from escaping? The oil is trapped between a layer of water above it and a layer of nonpermeable rock below it.
The oil is trapped between a layer of water above it and a layer of permeable rock below it.
The oil is trapped between a layer of nonpermeable rock above it and a layer of water below it.
The oil is trapped between a layer of permeable rock above it and a layer of water below it.

mechanics (greek   is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. the scientific discipline has its origins in ancient greece with the writings of aristotle and archimedes[1][2][3] (see history of classical mechanics and timeline of classical mechanics). during the early modern period, scientists such as galileo, kepler, and newton laid the foundation for what is now known as classical mechanics. it is a branch of classical physics that deals with particles that are either at rest or are moving with velocities significantly less than the speed of light. it can also be defined as a branch of science which deals with the motion of and forces on objects. the field is yet less widely understood in terms of quantum theory.

explanation:

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.