How do salmon find their way to their home stream?
Ans. 2, 4
What are the natural causes of an avalanche?
Ans. 1, 3
According to the lecture, what are the main consequences of the warm weather and a lot of rainfall in the Southern Coastlands?
Ans. 1, 4
According to the lecture: what are the main changes since the 1970s?
Ans. 1, 2, 3