The Canadian Shield contains the oldest exposed rocks
The span of the rainforest, covering Brazil, Bolivia, Peru, Ecuador, Colombia, Venezuela, Guyana, Suriname and French Guiana.
There are 40,000 plant species, 1,300 bird species, 3,000 types of fish, 430 mammals, and 2 million different insects
A small rise of temperature can ruin 3/4ths of the whole rainforest
The biodiversity can't be outmatched, for every one hectare, there are 750 types of tree species and 1500 types of plant species
The land might degrade when it's cleared for farming.
When vegetations are cleared, the land will lost protection and become more prone to soil erosion. There would be no roots to bind the soil particles or keep the moisture in the soil, and soil particles would be eroded by transporting agencies like wind.
They would be especially easier to be carried away when they are dry and loose. Loosened soil particles will also cause it to be easily washed away by water.
Eventually, the soil will lost nutrients and the land would become no longer fertile. It might turn into badland, in worst case senarios, desertification would occur.
Hope it helps!
External contact and intercultural exchange benefitted early civilizations. This is true of both the civilizations of sub-Saharan Africa and those of Southeast Asia.
In the case of Sub-Saharan Africa, one such civilization was that of the Kingdom of Kush. This was established around 1070 BCE. Kush developed in a region known as Nubia, in the Sudanese and southern Egyptian Nile Valley. Much of the success of the Kingdom of Kush came from its interactions with Egypt. Kush was an important producer of gold and ivory, and by trading with Egypt, it achieved great wealth. It also acquired some of the traditions of Egypt, such as the building of pyramids and mummification.
Southeast Asian civilizations also benefitted from trade in their early years, particularly maritime trade. The Austronesian people built the first ocean-going ships. They trade with areas such as Southern India and Sri Lanka. This also connected these people with the cultures of India and China. This trade led to a rise in technological knowledge and traditions. Some of the items that were exchanged in this trade were catamarans, outrigger boats, sewn-plank boats, coconuts, sandalwood, bananas, and sugarcane.