Geo next test

Question 1

Volcanic bombs

Answer 1

accrue after explosive eruptions and are pyroclastic material and partially molten >66mm

Question 2

Lahars

Answer 2

Mudflows made of a mixture of liquid water and pyroclastic materials and for from rain during eruptions

Question 3

Phahoehoe flows

Answer 3

smooth quicker ropy surface

Question 4

Aa flows

Answer 4

blocks and fragments slow

Question 5

Supervolcanos

Answer 5

volcanoes that erupt hundreds of square kilometers of material and produce huge calderas Ex: in yellow stone in the past 2 million years caused by a mantle plume. These leave behind calderas and change the climate by making it cooler and can lead to death.

Question 6

Felsic magma

Answer 6

More viscous than mafic magma because felsic magma is higher in silica and is cooler because it contains more water vapor

Question 7

Basalt plateaus

Answer 7

Fluid mafic lava erupts from long fissures then flows and overlaps

Question 8

dominant gas

Answer 8

makes up a big part of earths atmosphere after eruptions and is water vapor

Question 9

Famous calderas

Answer 9

Yellowstone
Crater lake oregan

Question 10

Nuee ardent

Answer 10

hot clouds of pyroclastic materials and gas from lava domes

Question 11

Volcanic explosivity index

Answer 11

from 0-8
measures explosive intensity of an eruption

Question 12

Iceland volcano

Answer 12

lwas a pyroclastic eruption and left behind ash traveling far in the wind

Question 13

Interpolate Volcanism

Answer 13

Hot spot Volcanism
Ex: Hawaiian chains which originated from a stationary mantle plume

Question 14

Extinct volcanoes

Answer 14

haven’t erupted in many years and show no signs of future eruptions

Question 15

pillow lava

Answer 15

bulbus interconnections masses from underwater eruption of basalt

Question 16

What do geologists use to measure eruptions

Answer 16

Volume of material erupted
Eruption cloud height

Question 17

Fissure eruptions

Answer 17

fluid magma erupts from fissures and form basalt plateaus

Question 18

Pyroclastic sheet deposit

Answer 18

Huge sheet like eruptions of solid magma and ash. Covers large areas after eruptions from fissures and calderas formation. They are felsic or Inrermediate.

Question 19

What do geologists look for when determining weather a volcano is about to erupt

Answer 19

Timeters and geometer record physical and chemical changes at volcanoes semesters detect harmonic tremors and gas emissions

Question 20

Where Volcanism occurs

Answer 20

Cir-cum pacific belt-convergent
Mediterranean belt-convergent
Mid-ocean ridges-divergent
Hot spots
All under ocean

Question 21

5 Maine volcanoes

Answer 21

Lava domes
Composite
Caldera
Cinder cone
Sheild

Question 22

Shield Volcano

Answer 22

gentle slopes
made of basalt and mafic pyroclasts
effusive(non-explosive
little danger

Question 23

Cinder cone

Answer 23

Pyroclastic and cinders
Steepest
smaller
most form in calderas or on sides of larger volcanos

Question 24

Composite volcano

Answer 24

Layers of lava flows, mud flows and pyroclastic debris
most dangerous
convergent
largest
intermediate

Question 25

Lava domes

Answer 25

Felsic or intermediate form when viscous lava is forced through conduit eject nuee ardentes form when the lava slowly emits up piling up creating the dome shape until it bursts

Question 26

calderas

Answer 26

volcanic depression formed when the middle collapses into magma chamber

Question 27

Underground structure

Answer 27

Pipe- conduit leading up to magma chamber beneath the surface Crater- depression in middle

Question 28

Active volcanoes in the Us

Answer 28

Mt snt helans Medicine Lake Three sisters Baker yellowstone Mt rainer-takoma washington

Question 29

Why are volcanoes on the west coast of north America and not on the east ?

Answer 29

subduction is on the west side by the Pacific belt on the east coast is the passive continental margin

Question 30

When have volcanos changed the climate

Answer 30

Year without summer- Tambora 1815