is for Aphanitic

Is the texture of igneous rock in which the crystalline components are not distinguishable by the naked eye: Both microcrystalline and cryptocrystalline textures are included.

is for Basalt

Basalt, extrusive igneous (volcanic) rock that is low in silica content, dark in color, and comparatively rich in iron and magnesium.

is for Caldera

A Caldera is a volcanic feature formed by the collapse of land following a volcanic eruption.

is for Diorite

Diorite is a grey to dark grey intermediate intrusive igneous rock composed principally of plagioclase feldspar (typically andesine), biotite, hornblende, and/or pyroxene.

is for Epicenter

The epicenter is the point on the Earth's surface that is directly above the hypocenter or focus, the point where an earthquake or other underground explosion originates.

is for Feldspars

Which is a group of the most common minerals of the Earth's crust. All feldspars contain silicon, aluminum, and oxygen and may contain potassium, calcium and sodium.

is for Gabbro

Gabbro is a dark, coarse-grained, intrusive igneous rock chemically equivalent to basalt.

is for Hinge

A Hinge is a zone of maximum curvature of a fold.

is for Igneous Rocks

rocks formed by solidification of cooled magma molten rock, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.

is for Joint

A Joint is a discrete discontinuity surface without evidence of displacement

is for Kink

A Kink is a tight curl, twist, or bend in a rock band.

is for Lava

Lava is molten rock expelled by a volcano during an eruption.

is for Magma

molten rock that sometimes forms beneath the surface of the earth (or any other terrestrial planet) that often collects in a magma chamber.

is for Neogene

a geologic period starting 23 million years ago and lasting either until today or ending 2.6 million years ago with the beginning of the Quaternary.

is for Orogeny

refers to forces and events leading to a large structural deformation of the Earth's lithosphere (crust and uppermost mantle) due to the engagement of tectonic plates and is the primary mechanism by which mountains are built on continents.

is for Phyllite

Argillaceous rocks in a condition of metamorphism between slate and mica-schist.