Answer:
the world is the earth we live in
The correct answer is - Stream velocity, channel width, and depth all increase.
When a stream is faced with a sudden increase of water, than the stream is starting to increase in velocity. The velocity is becoming bigger in the lower part of the stream. As the velocity increases, it is followed by an increase in width of the stream because it starts to flood the surrounding area, and because of the much bigger amount of water it also experiences increase in depth.
The basic force that drives plate tectonics are the convection currents.
Explanation:
The surface of Earth is cracked and divided into numerous tectonic plates. Some tectonic plates are very large, thus considered as major plates, while some are significantly smaller. There is constant motion of the tectonic plates, and they constantly move in some direction, causing the occurrence of numerous geological activities.
The tectonic plates don't just move on their own, but there is a driving force. That driving force comes from below them, from the mantle layer, in the form of the convection currents. The convection currents basically represent a circular motion (down-up), where the cooler and denser rocks sinks, while the hot and less dense ones go up, making enormous pressure on the surface.
Some of the major tectonic plates are:
- Eurasian
- North American
- African
- Pacific etc.
Some of the smaller tectonic plates are:
- Arabian
- Cocos
- Philippine
- Juan de Fuca etc.
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Answer:
A large part of South Asia receives rainfall mainly during the Indian Summer Monsoon (ISM) season of the year (Jun–Sep). The socioeconomic conditions of most of the developing countries in this region largely depend on the ISM rains. It also played important roles in rise and collapse of ancient civilizations in this region. However, the influence of the ISM on Indian ancient civilizations has not yet been fully explored though there were some attempts to correlate monsoon variation with their rise and fall. For example, in the mid to late Holocene period, Indus Valley or Harappan Civilization flourished in the western part of India from its early development, through its urbanization and eventual transformation into a rural society. Probably a prolonged decrease in the ISM rainfall caused the decline in the urban phase of the Indus Civilization around the 4.2 kyr BP global climate event. Another well-recorded early Holocene global climate event is the 8.2 kyr BP cooling event which also reportedly influenced ISM significantly, but its impact on human settlement is not clear in this region. The present study is a comprehensive review of the archaeological and climatological researches carried out on the role of ISM variability on the rise and fall of ancient Indian civilizations for the most part of the ongoing interglacial period, the Holocene. The review covers the studies on the period of the last 10 kyr as evidence suggests that human settlement and cultural developments in this region started around the beginning of this period. We have noted that the existing studies are mostly restricted to vague qualitative analysis of the weakening/strengthening of the ISM, and researches related to quantitative estimations of changes of the monsoon strengths and durations of drought events that caused collapse of civilizations are limited. Therefore, in the present analysis, emphasis has also been given on the requirement of estimating the absolute changes that might have caused cultural shifts. Some possible ways to quantitatively estimate the changes of some climate parameters are discussed.
