<h2>
<em><u>air</u></em><em><u> </u></em><em><u>pollution</u></em><em><u> </u></em></h2>
Explanation:
<h3><u>I</u><u> </u><u>don't</u><u> </u><u>know</u><u> </u></h3>
Answer:
The crop failures were caused by late blight, a disease that destroys both the leaves and the edible roots, or tubers, of the potato plant. The causative agent of late blight is the water mold Phytophthora infestans. The Irish famine was the worst to occur in Europe in the 19th century.
Answer:
Tribalism developed in the early 1900s and encouraged the nationalist spirit of Africans throughout the world.(B.)
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:
1) Solar System
2) Mass
3) Gaseous throughout
4) photosphere
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