The frequency of volcanic activity, is used to clasify volcanic mountains either as active, dormant or extinct.
Answer:
Wild garlic mustard is a highly destructive invasive species in the United States, but anyone can help stop its spread.
Explanation:
Answer:
Monarch butterfly migration is the phenomenon, mainly across North America, where the subspecies Danaus plexippus plexippus migrates each summer and autumn to and from overwintering sites on the West Coast of California or mountainous sites in Central Mexico. Other subspecies perform minor migrations or none at all. This massive movement of butterflies has been called "one of the most spectacular natural phenomena in the world".[1]
