IV. Answer in brief.
1. What are 'focus' and 'epicentre of an earthquake?
2. Which region is prone to cyclones?
3. When does a drought occur?
4. Which rocks are formed by volcanic eruption?
5. What is a tsunami?
V. Answer the following questions.
1. What are the safety measures for a cyclone hit area?
2. Give primary reasons for floods to occur.
3. What are the effects of an earthquake?
4. How can droughts be prevented?
5. What are the causes of Tsunami?
Social Studies v
Answers
Answer:
4th main
1 The hypocenter is the point within the earth where an earthquake rupture starts. The epicenter is the point directly above it at the surface of the Earth. Also commonly termed the focus.
2 The 12 most cyclone hazard-prone districts are Nellore and East Godavari, Krishna in Andhra Pradesh, Yanam in Puducherry, Balasore, Bhadrak, Kendrapara and Jagjitsinghpur in Odisha, South and 24 North Pargana, Medinipur, and Kolkata in West Bengal.
3 Droughts happen when there is not enough rain for a long period of time. It's not like a dry spell - there is so little precipitation (rain, snow, sleet or any kind of moisture) that a whole region starts to dry out. Sometimes a drought takes decades to develop fully and they are very difficult to predict.
4 When magma does reach the surface during a volcanic eruption, the rocks that form there are called lavas or volcanic rocks. The basic classification is the same as for plutonic rocks: with increasing silica content, they include: basalt, andesites, dacites, rhyolite, pumice and obsidian.
5. tsunami is a series of waves caused by earthquakes or undersea volcanic eruptions. ... Out in the depths of the ocean, tsunami waves do not dramatically increase in height. But as the waves travel inland, they build up to higher and higher heights as the depth of the ocean decreases
5th main
1. Fill buckets, sinks and baths with water in case the water supply becomes restricted.
Gather everyone indoors including any pets.
Stay away from doors, windows and exterior walls.
Turn off all electricity, gas and water and unplug all appliances.
2. 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
3. The effects from earthquakes include ground shaking, surface faulting, ground failure, and less commonly, tsunamis
4. Choose a water-efficient irrigation system such as drip irrigation for your trees, shrubs, and flowers. Turn irrigation down in fall and off in winter. Water manually in winter only if needed. Put a layer of mulch around trees and plants to reduce evaporation and keep the soil cool.
5. Tsunami are waves caused by sudden movement of the ocean surface due to earthquakes, landslides on the sea floor, land slumping into the ocean, large volcanic eruptions or meteorite impact in the ocean.
Answer:
1)The hypocenter is the point within the earth where an earthquake rupture starts. The epicenter is the point directly above it at the surface of the Earth. Also commonly termed the focus.
2)The 12 most cyclone hazard-prone districts are Nellore and East Godavari, Krishna in Andhra Pradesh, Yanam in Puducherry, Balasore, Bhadrak, Kendrapara and Jagjitsinghpur in Odisha, South and 24 North Pargana, Medinipur, and Kolkata in West Bengal.
3)Droughts happen when there is not enough rain for a long period of time. It's not like a dry spell - there is so little precipitation (rain, snow, sleet or any kind of moisture) that a whole region starts to dry out. Sometimes a drought takes decades to develop fully and they are very difficult to predict.
4)When magma does reach the surface during a volcanic eruption, the rocks that form there are called lavas or volcanic rocks. The basic classification is the same as for plutonic rocks: with increasing silica content, they include: basalt, andesites, dacites, rhyolite, pumice and obsidian.
5) A tsunami is a series of waves caused by earthquakes or undersea volcanic eruptions. ... Out in the depths of the ocean, tsunami waves do not dramatically increase in height. But as the waves travel inland, they build up to higher and higher heights as the depth of the ocean decreases.
V
1)Few precautions to be followed during cyclones are:
Fill buckets, sinks and baths with water in case the water supply becomes restricted.
Gather everyone indoors including any pets.
Stay away from doors, windows and exterior walls.
Turn off all electricity, gas and water and unplug all appliances.
2) 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.
3)The effects from earthquakes include ground shaking, surface faulting, ground failure, and less commonly, tsunamis.
4)Choose a water-efficient irrigation system such as drip irrigation for your trees, shrubs, and flowers. Turn irrigation down in fall and off in winter. Water manually in winter only if needed. Put a layer of mulch around trees and plants to reduce evaporation and keep the soil cool.
5)Tsunami are waves caused by sudden movement of the ocean surface due to earthquakes, landslides on the sea floor, land slumping into the ocean, large volcanic eruptions or meteorite impact in the ocean.