Answer: D. It can melt to a depth of a few meters in summer, then refreeze in winter.
Explanation:
Permafrost is ground which remains frozen for two or more years. Permafrost consists of soil, rock and sand fused together by ice. Mostly found in areas in high altitude, the Arctic, Antarctica, it is common in periglacial environments where temperatures are below freezing
.
The topmost layer of permafrost can melt in summer and refreeze in winter. This thawing and refreezing produces a ground pattern called columnar joints similar to the one formed when molten lava cools.
Answer:
D. All of these choices are correct.
Explanation:
A fossil is the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock so all of the options apply.
Answer:
Explanation:
I'd hate to be answering this and be color blind.
The largest circles are Cyclones. Together, they account for about 300000 deaths. The one that was the most was the one in Indonesia but it it is not a choice. The next largest one is the one in 1991 in Bangladesh, in 1991.
So the answer is B.
Europeans first began exploring Oceania in the 16th century.
Answer:
great than
Explanation:
it's a symbol used to show that it's bigger than something