Answer:
C) the rock surrounding the ore was too hard for picks and hammers.
Explanation:
Miners realized that the newly discovered Comstock Lode would require different technology than usual instruments of mines in California because the rock surrounding the ore was too hard for picks and hammers. The rocks surrounds the ore is very hard which can't be broken with the help of picks and hammers so for the extraction of ore, new technology is needed to extract the ore from the rocks.
Answer:
grow only two different types of crops
Shanghai (上海), is China's most populous city situated on the eastern coast of the country, a port on the estuary of the Yangtze River.
Until World War II, Shanghai contained areas of British, French, and American settlement.
Answer:
atmosphere,biosphere,geosphere,hydrosphere
You can usually tell the difference between a caldera and crater by studying <span>a feature's size and formation. In terms of size, a caldera is often relatively larger than ordinary craters. A caldera is so big that it causes explosive eruptions. In terms of formation, a caldera is a large depression caused when a magma chamber is emptied. A crater is a bowl-like formation at the top of volcanoes where lava comes out.</span>
