Final answer:
a. The strike of a rock layer is measured in map view as its compass bearing, while the dip is measured in cross-sectional view as the angle of inclination.
Step-by-step explanation:
The correct answer is a) Strike, dip.
Strike is measured in map view as the compass bearing of a tilted rock layer where it intersects a horizontal plane. For example, if a rock layer's strike is 315°, it means that it intersects the horizontal plane at a bearing of 315° from north.
Dip, on the other hand, is measured in cross-sectional view as the angle of inclination from horizontal of a tilted rock layer. For instance, if a rock layer dips at an angle of 30°, it means that it deviates 30° from a horizontal plane.