Which word identifies one stage of volcanic activity?
dormant
explosive
underground
quiet
dormant
Which statement explains what happens as magma rises inside a volcano?
Gases will contract in the chamber.
The pressure of the gas will disappear.
The magmatic pressure decreases.
Magma moves to other chambers.
The magmatic pressure decreases.
Which phrase describes a sill?
- fills in valleys and rivers
- is a hardened magma intrusion
- cuts vertically through older rock layers
- is built up by numerous eruptions over thousands of years
is a hardened magma intrusion
A volcano that has not erupted in a very long time suddenly has a plume of steam coming from it. Which best describes this volcano?
was dormant and is now active
was quiet and is now active
was extinct and is now explosive
was dormant and is now explosive
was dormant and is now active
Which feature is created on the exterior of a volcano when it erupts?
magma chamber
crater
hot spot
boundary
crater
Which event causes a volcanic eruption?
magma turning into lava
water being heated by magma
explosions occurring in magma chambers
magma cutting through older rocks
explosions occurring in magma chambers
Which statement describes convergent boundaries?
Rifts form.
Subduction occurs.
Plates push away from each other.
Mid-ocean ridges mark locations.
Subduction occurs.
Which phrase describes a volcano that is not expected to erupt again?
quiet volcano
extinct volcano
dormant volcano
explosive volcano
extinct volcano