Answer: D. Pressure flaking
Explanation: Pressure flaking is the method of applying pressure by means of a pointed wood or bone near the edge of a flake or blade, to detach small flakes from both sides. This provides a greater means of controlling the direction and quantity of the applied force thereby facilitating the early production of sharper and finely detailed tools.
The archaeological discovery in 2010 in Blombos Cave, South Africa, places the use of pressure flaking by early humans to make stone tools back to 73,000 BCE, which is 55,000 years earlier than previously accepted. The previously accepted date of around 20,000 years ago was based upon the evidence previously available which was derived from findings of the Upper Paleolithic Solutrean culture in France and Spain.
Index fossils are the fossils of organisms that existed over a wide area but only for a limited time period.
Explanation:
The index fossils are fossils that are of huge use for the scientists of all fields when it comes to the Earth's history and its reconstruction. These fossils have this name because they are good indicators about a particular time period. The scientists are able to determine a geological period without even examining the layers, but just by simply finding these fossils.
There are several characteristics that make the index fossils special. They are found over very large area. Not just that they are found in lot of places, but they are also abundant. They existed only for a limited time period, thus being good indicator of a particular geological period. They are easy to distinguish from the other fossils.
The fossils can be divided into five main categories:
- trace fossils
- molds and casts
- petrified fossils
- carbon films
- preserved remains
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Answer:
Silver was more important in the Spanish and Portuguese Americas, where there were several large mines where thousands of tonnes of silver were extracted for over two centuries. Two particular regions to highlight are Potosi, in Bolivia, and the state of Minas Gerais, in Brazil.
Fur trade was more important for the French and English colonists in North America, especially for the first. In fact, most of the first French colonizers, in what is now Quebec, but also in some other areas, where fur traders, and to develop that economic activity, they kept important political and economic relations with the Native Americans.
Explanation:
Answer:An independent country since 1828, with strong ties to the United Kingdom, France, and Italy, Uruguay developed throughout much of the 20th century as one of Latin America's more progressive societies, notable for its political stability, advanced social legislation, and a relatively large middle class.
Explanation:education
