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प्रश्न
What is the difference between magma and lava?
What is the main difference between magma and lava?
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उत्तर
| Magma | Lava |
| Molten material moving under the earth’s crust is called magma. | When magma comes to the surface of the earth, it is known as lava. |
| Molten rock beneath the Earth’s surface. | Molten rock that has erupted onto the Earth’s surface. |
| Contains dissolved gases and crystals. | Loses most gases when it erupts. |
| Found in magma chambers. | Flows over land and cools to form solid rock. |
| Temperature is generally higher. | Slightly cooler after exposure to air. |
संबंधित प्रश्न
Explain the types of volcanoes on the basis of periodicity of eruption with examples.
Give one example of volcanic mountains.
What is a volcano?
Give one example of an active volcano.
What is called the Pacific Ring of Fire? Why is it called so?
Name the three types of volcanoes on the basis of the frequency of their eruption.
What are known as Shield volcanoes?
Match the Following:
| Column A | Column B |
| 1. Vent | (a) An active volcano |
| 2. Extinct | (b) Hot water fountain |
| 3. Geyser | (c) Dead Volcano |
| 4. Mt. Stromboli | (d) An opening in the earth's crust through which lava flows. |
| 5. Cinder Cone | (e) A volcanic landform. |
Explain the various parts of a volcano.
Name the largest active volcano in the world.
In which belt most of the volcanoes of the world are found?
Distinguish between :
Volcanic Dust and Volcanic Ash.
Describe the effect of volcanic eruption of Karakatoa in 1883.
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Give two of its main characteristics of Geysers
State two ways in which lava may come out of the earth’s crust giving an example of each type of these volcanic activities.
Give one word for the following :
The lava which is poor in silica and rich in iron and magnesium.
Give one word for the following :
A volcano which has the possibility of erupting in future.
Give one word for the following:
A large sill of acid lava which has solidified gradually giving a dome-like shape.
What are the influences of volcanoes eruption on man?
OR
What is the importance of volcanoes?
OR
Mention adverse and beneficial effects of volcanoes.
What is the following :
Epicentre
An example for active volcano is ______.
Give an example of extinct volcano.
Distinguish between Active volcano and dormant volcano
How many active volcanoes in the world?
Choose the odd one.
Stromboli, Helens, Hawaii, Fujiyama
