The answer is deep sea trenches
The country that is an isthmus and links central and Souh America is Panama
Recently, Russia faces international conflict, especially about Venezuela Problems with EEUU.
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D. Cambodia (mostly), Thailand, Vietnam
<span>If you see a very tall, rock feature that looks like a jagged, rectangular block sticking out of the ground, you're probably observing a volcanic neck. Also known as a lava neck or volcanic plug, a volcanic neck is formed when magma solidifies within a vent of an active volcano. This can harness great amounts of pressures which could lead to an explosive eruption.</span>
