カテゴリー 全て - volcanoes - magma

によって Steve Bloom 14年前.

250

Steve Igneous

Igneous rocks form from the cooling and solidification of magma, which can originate from volcanic activity or beneath the Earth's surface. They are categorized into intrusive and extrusive types based on where the cooling process occurs.

Steve Igneous

Steve Igneous

-melted rock (minerals) called magma

-can come from volcanoes

-can be under the ocean

-near tectonic plate edges

under the ocean or on the surface

volcanoes

magma

no fossils

Intrusive

gabbro
Granite
hardens under the earths surface
cool slowly
course or large crystals

plate seperation ridges

several minerals

no layering

no acid reaction

extrusive

Ryolite
obsidian - volcanic glass
called lava when on the surface
came from a volcanoe or large cracks
"holey"
cools quickly
small crystals
often dark