Answer: Option [A]Magma which is forced onto Earth's surface is known as Lava. Magma is extremely hot liquid and semi-liquid rock located under Earth's surface. When magma flows onto Earth's surface, it is called lava.
Answer: Option [A]Volcanoes that erupt frequently are known as active volcanoes. Active volcanoes have a recent history of eruptions; they are likely to erupt again. Dormant volcanoes have not erupted for a very long time but may erupt at a future time. Extinct volcanoes are not expected to erupt in the future. Inside an active volcano is a chamber in which molten rock, called magma, collects.
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Answer: Option [D]Volcanoes that haven't erupted in historic times are known as extinct volcanoes. Extinct volcanoes are those which have not erupted in human history. Examples of extinct volcanoes are Mount Thielsen in Oregon in the US and Mount Slemish in Co. Antrim.
Answer: Option [C]Basic lava erupts out of volcano, throwing out mainly ash.
Answer: Option [C]The correct answer is Huge. They are the world's largest active volcanoes, rising over 9 km above the sea floor around the island of Hawai'i.
