Question

answer this question of std 8 social science​

Answer 1

Answer:

ans .1

CAUSES OF VOLCANIC ERUPTIONS ARE :

1. PLATE TECTONICS

2. VOLCANOES

2 ADVANTAGES :

1. formation of hotsprings

2.it loosens the soil making minerals more accessible to man kind.

ans.2

hurricanes effect people’s lives because they can do so much damage. Winds can damage houses, trees, and any outdoor property. If the hurricane doesn’t destroy where people live then the major flooding after hurricanes might. When homes are destroyed, people may have to rebuild homes and towns. People from the town would have to “clean up” the mess made by the hurricane.

ans . 3

Localized flooding may be caused or exacerbated by drainage obstructions such as landslides, ice, debris, or beaver dams. Slow-rising floods most commonly occur in large rivers with large catchment areas. The increase in flow may be the result of sustained rainfall, rapid snow melt, monsoons, or tropical cyclones.

Severe flooding is caused by atmospheric conditions that lead to heavy rain or the rapid melting of snow and ice. Geography can also make an area more likely to flood. For example, areas near rivers and cities are often at risk for flash floods. ... Floods can happen almost anywhere.

Floods occur when the discharge of the stream becomes too high to be accommodated in the normal stream channel. When the discharge becomes too high, the stream widens its channel by overtopping its banks and flooding the low-lying areas surrounding the stream. The areas that become flooded are called floodplains.

ans. 4

Forest fires increase carbon dioxide levels in the atmosphere, contributing to the greenhouse effect and climate change. In addition, ashes destroy much of the nutrients and erode the soil, causing flooding and landslides.

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Answer 2

Ans 1... two causes of volcanic eruption are:1. the buoyancy of the magma, the pressure from the exsolved gases in the magma. 2..the injection of a new batch of magma into an already filled magma chamber.

Two advantages of volcanic eruption are:1. They helped cool off the earth removing heat from its interior. Volcanic emissions have produced the atmosphere and the water of the oceans. 2...Volcanoes make islands and add to the continents. Volcanic deposits are also used as building materials.

ANS2..

Hurricanes effect people's lives because they can do so much damage. Winds can damage houses, trees, and any outdoor property. If the hurricane doesn't destroy where people live then the major flooding after hurricanes might. When homes are destroyed, people may have to rebuild homes and towns.

ANS3....

...Severe flooding is caused by atmospheric conditions that lead to heavy rain or the rapid melting of snow and ice. Geography can also make an area more likely to flood. For example, areas near rivers and cities are often at risk for flash floods.

ANS4.....

Effect of forest fire are: But fire can be deadly, destroying homes, wildlife habitat and timber, and polluting the air with emissions harmful to human health. Fire also releases carbon dioxide—a key greenhouse gas—into the atmosphere. Fire's effect on the landscape may be long-lasting.

And cause are:

Forest fires always start by one of two ways - naturally caused or human caused. Natural fires are generally started by lightning, with a very small percentage started by spontaneous combustion of dry fuel such as sawdust and leaves. On the other hand, human-caused fires can be due to any number of reasons.