Depending on the area, it can be dry and humid, or it can be cold and snowy, or it can be sunny and hot, or rainy and humid.
River valley trade made them key economic areas.
Hope this helped. :)
Puerto Rico
The Greater Antilles are a group of larger islands in the Caribbean Sea. They include 4 major islands – Cuba, Jamaica, Hispaniola and, the smallest, Puerto Rico.
Answer:
B. Aerobic bottom water
D. High organic productivity in the overlying oxygen rich water
Explanation:
A Shale is a sedimentary rock usually formed from silt and clay-size mineral. There are different colors of Shale. The Black Shale is formed under anaerobic conditions. This means that oxygen is deficient in the water where the Shale forms.
A little amount of organic materials is required for the formation of Black Shale and because Black Shale is formed in an environment lacking oxygen, an oxygen-rich water would not be necessary for its growth. Sediments are necessary in the formation of Black Shale.
