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grin007 [14]
3 years ago
11

What is the cooling and hardening of magma or lava?

Geography
2 answers:
neonofarm [45]3 years ago
7 0
<span>When magma reaches the surface through a volcano, it is called lava. When lava cools, it forms extrusive igneous rock. The process by which rocks are worn down by wind and water, creating sediment.</span>
frozen [14]3 years ago
5 0

Answer:

Lava is the magma expelled during a volcanic eruption. In other words, magma changes its name to lava when it comes to the surface. The molten rock reaches scorching temperatures, exceeding 1500ºC.

When lava gets in contact with surface elements such as air and water, it cools and hardens, forming what is known as igneous rock.

Details:

The rhyolite lava weighs less and has a lighter color than basalt. It is very thick, so it flows very slowly. It eventually condenses around the cavity from which it emerged, often forming a deposit called a lava dome. When it cools rapidly, it can form a natural glass called obsidian.

When lava flows into the sea, it is rapidly cooled by water. When solidified under water, it resembles a pile of pillows, so it is known by the name of pillow lava.

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Answer:

The time will be "2 hours".

Explanation:

Around 10 km/hr, lava eruptions were travelling. The vents was just 15 km (9.3 mi) away Kalapana city as well as 20 km (12.6 mi) from Pahoa city.  

So, we therefore need add the method, which would be: to taking out another time that civil defense officials just had to assess a city.

⇒  Time = \frac{Total \ distance}{Flow \ rate \ of \ lava}

Thus, to measure the time spent throughout the community of Kalapana,

⇒  Time=\frac{15}{10}

              =1.5 \ hours

The civil defense officers provide 1.5 hours of time each assess the city of Kalapana.  

In order to measure the time spent in the towns of Pahoa,

⇒  Time = \frac{20}{10}

              =2 \ hours

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