A = πr²
r = 3π
A = π(3π)² = 9π².π = 9π³ ≈ 279.05649
The Amazon River in South America served as a significant roadway through the centuries. For instance, the river allowed Orellana, a Spanish explorer in the 1500s, to spread Christianity to Amazon inhabitants. Explorers were able to travel up the entire river and return by the same route, which emphasizes the practicality of it as a travel method. Additionally, naturalists on these expeditions spread ideas through their findings on the Amazon. In conclusion, the Amazon River provided an effective path that encouraged the spread of global knowledge and beliefs.
Answer:Geysers like Old Faithful are only formed under specific conditions, making them relatively rare. Magma under the Earth’s surface superheats pockets of underground water, building pressure that eventually pushes the water upwards. Rhyolite, a volcanic rock high in silica content, lines the tunnel through which the water escapes its underground pocket, creating a pipe that can withstand the incredible heat and pressure as the water erupts above ground.
