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.
The answer is number 2 because continental means dry maritime means wet polar is cold tropical means warm so if there are thunder storms then its wet so maritime and tropical because its in the summer so its maritime tropical
Answer: 1917, two revolutions swept through Russia, ending centuries of imperial rule and setting into motion political and social changes that would lead to the formation of the Soviet Union.
Explanation:
The true statement is - B. The rock cycle is powered by the movement of tectonic plates.
Almost all rocks on our planet came to existence because of the tectonic activity. The movement of the tectonic plates is enabling the magma from the mantle layer to come to the surface, cool off, and create new layers of rocks. On the other hand, the same process, where there's subdustion zones, is moving the existing rocks down into the mantle layer where they are ''recycled'' in way, and this process is continuing to happen all the time.
Answer:
TRUE
Explanation:
Cinder cones are usually characterized by the cone-shaped, steep sloping volcanoes, and are typically comprised of pyroclastic materials. These volcanoes have a slope of about 30° to 40° and have a summit at the mouth of the volcano. They are of short height and are found mostly adjacent to the bigger volcanoes such as strato-volcanoes and central vent volcano. They erupt at a much faster rate compared to the long-lived ones.
Thus, the above-given statement is True.
