D. high and low levels of silica in the different type of lava.
Explanation:
The volcanoes have different types of explosions. Some tend to be highly explosive, some less explosive, some don't have explosions at all, while some have combinations of different eruptions. The reason for this diversity in the eruption types is mostly the composition of the magma, or rather how high is the silica content in it.
Basically, the higher the silica level in the magma the higher the explosiveness, and the lower the silica level the lower the chances of explosiveness. This is the case because the higher amount of silica makes the magma thicker, so the gasses are trapped and they explode, while when the lower silica content makes the magma less thick, so the gasses are not trapped and explosions are lacking.
The melting of the polar ice cap
I would be interested in volunteering for environmental protection, working with kids in an NGO, and raising money for underprivileged kids.
<h3>Give a brief account on volunteering.</h3>
Volunteering is the act of someone or a group voluntarily giving their time and energy to community service. In fields like medical, education, or emergency rescue, many volunteers have specialized training. Others serve when called upon, such as in the event of a natural disaster. The word first appeared in print in 1755. It was formed from the noun volunteer, from the Middle French voluntaire, around around 1600, meaning "one who offers oneself for military duty." The word was first documented in its non-military usage in the 1630s. Together with the phrase "community service," the word "volunteering" has become more popular recently.
One of the biggest and oldest charities that aids underprivileged people is The Salvation Army. Although it was founded as a charity, it has since organized a number of volunteer programs. There were not many formal charitable organizations to help those in need before the 19th century. The Rotary International, Kiwanis International, Association of Junior Leagues International, and Lions Clubs International are just a few of the volunteer groups that were established during the first few decades of the 20th century.
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<span>La biotecnología es un área multidisciplinaria, que emplea la biología, química y procesos, con gran uso en agricultura, farmacia, ciencia de los alimentos, ciencias forestales y medicina. Probablemente el primero que usó este término fue el ingeniero húngaro Karl Ereky, en 1919.</span>
