Question

location single, specific spot multiple, scattered areas impact pattern concentrated pollution in specific areas widespread contamination effects timeline immediate effects effects over time control difficulty easier to control to control word bank: concentrated, long - term, harder

Explanation:

Step1: Analyze the word bank and the context

We have the words "concentrated", "long - term", "harder" in the word bank. For the "Effects Timeline" column, since the first row (point source) has "Immediate effects", and non - point source (multiple, scattered areas) is a different type. Non - point source pollution usually has effects that accumulate over time, so "long - term" fits for the "Effects Timeline" of non - point source.

Step2: Analyze the "Control Difficulty"

Point source (single, specific spot) is "Easier to control". Non - point source (multiple, scattered areas) is more complex, so "harder" fits for the "Control Difficulty" of non - point source.

Answer:

For the "Effects Timeline" of non - point source: long - term. For the "Control Difficulty" of non - point source: harder.