Final answer:
An intervening opportunity is an alternative option that fulfills a person's goal and stops them from reaching their initial target, like a closer job offer. An intervening obstacle is a barrier that prevents a person from reaching their destination, like a flooded road blocking access to a village.
Step-by-step explanation:
An intervening opportunity refers to an attractive, alternative option that satisfies a goal closer to someone's starting point, thereby preventing them from reaching their initial destination. For example, let's say a person is planning to travel to a distant city for a job, but they find a similar, appealing job offer in a closer town, which they accept. This nearby job opportunity serves as an intervening opportunity as it stops them from moving to the far city.
An intervening obstacle, on the other hand, is a challenge or barrier that prevents someone from reaching their intended destination or goal. An example is when a traveler heading to a remote village is unable to complete their journey due to a river flood that blocks the road. In this case, the flood is an intervening obstacle because it halts progress toward the original aim. Both concepts are influential in understanding human migration and movement patterns.