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. A substance, energy source, or organism used by humans
Explanation:
Its not man made like the others
Answer:
The Romans ruled Pompeii in 79 CE - they year of the volcanic eruption.
The answer is B. physical because it just is. A physical map shows elevation or like mountain ranges and hills and plateaus
By car, the shortest route is 3295 km (for connections in Miami and Seattle).
By car, the shortest route is 2639 km (Los Angeles and Washington).
<span>The shorter route is Los Angeles and Washington.
</span>The longer route is Miami and Seattle.
