Questions 1-3 are about the following passage.

    A volcano is an opening in the Earth's crust that allows for substances below the earth to come up and escape. The Earth's crust sits on tectonic plates. These plates are like puzzle pieces. In the places where they are coming apart or moving toward each other, volcanoes are likely to form.

    In the Mid-Atlantic Ridge, where the plates are moving away from each other, new crust needs to be formed to fill the gap. The creation of this crust creates pressure reduction and melts the mantle, resulting in volcanoes. Most people don't know that most of this volcanic activity actually takes place in our oceans. The rest of it has resulted in the ridge rising above sea level on islands such as Iceland.

    Some volcanoes are created where the plates come together. This is true in the Pacific Ring of Fire. The Pacific Ring of The is a horseshoe shape that borders the shore of the Pacific Ocean. Along this ring, in countries such as Mexico, the Philippines, Japan, and New Zealand, many volcanoes have formed.