Question

question 1
briefly describe what causes a volcanic eruption to be explosive.
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question 2
how can an intrusive landform become exposed to the air and visible?
check my answer
question 3
why does underwater hot - spot volcanism tend to form chains of islands? for that matter, why doesnt it form one huge, single island?

Explanation:

Question 1: High - silica content magma and high gas content cause explosive eruptions. High - silica magma is viscous, trapping gas. When pressure builds, it is released explosively.
Question 2: Erosion of overlying rock layers exposes intrusive landforms. Weathering and erosion gradually wear away the surface rock, revealing the intrusive igneous rock below.
Question 3: Tectonic plates move over a stationary hot - spot. As the plate moves, new volcanoes form over the hot - spot, creating a chain of islands. The movement prevents the formation of one large island as the volcano is carried away from the hot - spot source before it can grow too large.

Answer:

Question 1: High - silica content and high gas content in magma cause explosive eruptions.
Question 2: Erosion of overlying rock layers exposes intrusive landforms.
Question 3: Tectonic plate movement over a stationary hot - spot forms island chains and prevents the formation of one large island.