* HELP PLEASE *

Which of the following items is a cause that can correctly complete this chart?
A)Active volcanoes spew ash and lava over the landscape.
B)Air pollution spreads through the water cycle.
C)Large areas of land are set aside as conservation areas.
D)Forests are cleared for farming and timber.

These factors threaten north americas ecosystems

Which ecosystem best fits the characteristics listed below? which ecosystem best fits the characteristics listed below? ii. seasonal migrations of millions of wildebeests, zebras, and elephants iii. large numbers of predators, such as lions iv. acacia trees and grasses a. the congo rainforest b. the african mangroves c. the serengeti grasslands d. the sahel

Plz answer ! find the alps. what countries and country borders intersect this major mountain range? which borders seem to be defined by the edges of the mountains? which borders seem to be defined by the edges of the mountains? which borders cut across the mountains?