Answer:
The eruption of volcano
Explanation:
The volcano named Mount Vesuvius was one of the most dangerous volcanoes in the world and it was a stratovolcano which is characterized by the presence of steep slopes, and alternating layers of volcanic ashes and pyroclastic materials.
The city of Pompeii was located near to this volcano and was destructed when it violently erupted in 78 CE. A large number of pyroclastic materials, along with volcanic ashes, volcanic blocks and toxic gases were released from this volcano at the time of eruption, which covered the city making it up to 6 meters of thick ash beds killing numerous people.
Answer:
Absolute refractory period
Explanation:
The absolute refractory period is short in an action potential. During the refractory period, there is no occurrence of another action potential. There would occur two types of refractory periods
Absolute refractory periods: Absolute period is the period when another action potential won't occur immediately after a first action potential. This refractory period also called an effective refractory period. This period happened because the sodium channel is inactivated and is stable in the same way until the hyper polarization does not occur.
Relative refractory period:
Answer:
1. Economic Union
2. Autonomous and Sovereign country
Explanation:
The Euro was established on January the 1st in 1999. Its purpose was to unite the countries of the Eastern and Western Europe. But not only that, it's main purpose was to help economically all the countries of the European Union; by having a same monetary system, the economy would flourish and build from it, making each country as strong as everyone else. Besides, all countries within the European Union would be autonomous and the would dictate their own rules; in other words, they would remain sovereign, without having anyone making decisions from the outside.
