The Earth Rotates on its axis from (west to east)
Answer:
Niger
Explanation:
The northern part of the river, known as the Niger bend, is an important area because it is the major river and source of water in that part of the Sahara desert. This made it the focal point of trade across the western Sahara, and the centre of the Sahelian kingdoms of Mali and Gao.
The correct answer is - A. 2.5
Australia is a country where the ethnic background of the people is very diverse. It has initially been settled by the Aborigines, and much later came the European settlers. The Aborigines found themselves in a very bad situation when the European settlers arrived because the Europeans tried multiple methods to wipe them out both culturally and ethnically. The initial estimates about the Aboriginal population in Australia and their number in the present do not differ much, but it only represents around 2.5% of the total population. The population of the Aborigines have been decimated for a couple of centuries so their numbers remained static, while there has been an ever growing population of new settlers which became dominant.
Answer:
About 3500 meters of summit of a composite volcano collapsed after an explosive eruption of about 500 cubic kilometers of pyroclastic material. Later the caldera was eventually filled with water.
Explanation:
Crater Lake is one that is found to occupy a basin in Mount Mazama in south-central Oregon in the western United States. Mount Mazama, which is about 12,000 ft (roughly 3,700m) collapsed during an intense volcanic eruption, which led to the formation of volcanic depression called caldera.
Pyroclastic flows of pumice and ash affected the nearby areas which also included the water body that drained the mount Mazama.
Answer:
a) Yes! the American chestnut tree is a native species. The American chestnut tree was present before the Europeans arrived in North America in the 1600s. Since a native species has been defined as any species that was present in North America before the arrival of the Europeans, then it is a fact that the North American chestnut tree is a native species.
b) The chestnut blight is an invasive species that is native to east East Asia, and was accidentally introduced into North America around the early 1900s, when the Japanese chestnut was commercially cultivated in the United States.
c) Invasive species tend to proliferate at a very high rate because they lack some natural constraints in the new environment such as natural predators, competition, and as in the case of this chestnut blight; the host has no natural defense mechanism against them. These conditions allow them thrive more than they would in their natural environment, unchecked
d) Yes, I agree with this idea, albeit to some extent. The development of hybrid chestnut resistant to the chestnut blight will possibly return the forests back to how it was before the Europeans arrived in the 1600s, but the genetic conservation will be altered, since these new trees will be an hybrid of the old trees, and the forest won't truly be as it was before the 1600s