Who was the first person to suggest that all of the continents had been once joined together as a
supercontinent called Pangaea and when was that idea proposed? What will be an ideal response?
The German meteorologist Alfred Wegener proposed the existence of Pangaea in 1915.
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Intensive subsistence agriculture
A) is used primarily in parts of the world with small populations. B) involves more human labor than swidden agriculture. C) usually achieves only low productivity. D) is most commonly practiced in areas with little rainfall. E) relies on chickens and geese as draft animals.
The main feature shown in this photograph illustrates
A) weathering.
B) flooding.
C) permafrost.
D) slope failure.
The recommended percentage of daily values per serving of which of the following must be shown on a food packaging label?
A) calcium B) vitamin A C) vitamin C D) all of these
________ is a supermassive black hole sitting in the galactic center of the Milky Way
A) Messier 31 B) Centaurus A C) The Orion Spur D) Sagittarius A*