Lecture 4: Volcanic Landforms

Question 1

Extrusive rocks

Answer 1

Lava erupting at the surface (volcanism)

Question 2

Intrusive rocks

Answer 2

Magma staying below the ground (plutonism)

Question 3

3 main factors for magma production

Answer 3

High temp, increased h20, low pressure

Question 4

2 types of eruptions

Answer 4

Effusive and explosive

Question 5

Characteristics of effusive eruptions

Answer 5

Iron-rich, flows easily and high temp

Question 6

Characteristics of explosive eruptions

Answer 6

Silica-rich, very viscous and lower temp

Question 7

Types of volcanoes

Answer 7

Shield, cinder-cone and composite

Question 8

Volcanic arcs

Answer 8

Chain of volcanoes formed above a subducting plate

Question 9

Types of volcanic arcs

Answer 9

Island (ocean-ocean) vs continental (ocean-continental)

Question 10

Calderas

Answer 10

Volcanic hollow created by explosion or collapse

Question 11

Plutons

Answer 11

Magma solidifying below the surface

Question 12

Batholiths

Answer 12

Large plutons

Question 13

Dikes

Answer 13

Vertical pluton intrusions

Question 14

Sills

Answer 14

Horizontal pluton intrusions