rock structures
arch of rock layers
anticline
magma that reaches the surface
lava
Where are most active volcanoes found in the world?
Pacific rim or RIng of Fire
slate or gneiss
metamorphic
color of minerals powder
streak
trough of rock layers
syncline
volcano with no historical record of eruption
extinct volcano
smallest to greatest bomb ash cinder
ash cinder bomb
limestone or chalk
sedimentary
amount and quality of light reflected from surface
luster
sunken rock layer caused by empty magma chamber
basin
depression caused by collapse of cone
caldera
a volcano that emits mostly cinders ashes and bombs
cinder cones
marble or quartzite
metamorphic
two or more substances chemically combined
compound
extinct underwater volcano
seamount
tiny, angular glassy fragments
ash
volcano emits lava and solid debris alternating between quiet and explosive eruptions
stratovolcanoes
conglomerate or breccia
sedimentary
ratio or rock to water
specific density
flat top hill with steep sides
mesa
mass of lava that solidifies in flight
bombs
emits mostly lava in quiet eruptions
shield volcanoes
granite or gabbro
igneous
how mica breaks into flat sheets
fracture