Answer:
5200 BC
Explanation:
The first agriculture in Africa began in the heart of the Sahara Desert, which in 5200 BC was far more moist and densely populated than today. Several native species were domesticated, most importantly pearl millet, sorghum and cowpeas, which spread through West Africa and the Sahel
Answer:
Warm climates favor chemical weathering;
Cold climates favor mechanical weathering;
Chemical reactions occur faster at higher temperatures;
Explanation:
The climate has a crucial role in the processes of weathering, on their type, their quickness, their end result. The warmer climates where there's also more precipitation are the places where the weathering is the quickest. The warmth, water, and lot of biomass provide the conditions for strong chemical weathering, thus breaking up the rocks into fine sediments very quickly. The cold climates on the other hand have much slower weathering rates. The reason for this is the absence of liquid water, as well as the absence of biomass. On the other hand, the ice in this climates contributes to mechanical weathering, breaking up the rocks with the pressure it creates inside and on them.
Answer:
C
Explanation:
a slow, determined chipping away (if you chip away at something, you gradually make it weaker or less likely to succeed by repeated efforts.)
Answer:
A) westward expansion for thousand of American settlers
Explanation:
Decreased mobility and increased frequency of tremors in patients with Parkinson's disease.
