Answer:
Conquistadors came from all over Europe. Some were German, Greek, Flemish, and so on, but most of them came from Spain, particularly southern and southwestern Spain. The conquistadors typically came from families ranging from the poor to the lower nobility. The very high-born rarely needed to set off in search of adventure.
Explanation:
'Climatic variations' and 'Human activities' can be regarded as the two main causes of desertification. removal of the natural vegetation cover（by taking too much fuel wood）, agricultural activities in the vulnerable ecosystems of arid and semi-arid areas, which are thus strained beyond their capacity.
sedimentary rocks provide geologists with information necessary to study the history of earth.
Answer:
definitions part of speech and pronunciation of the word
