Scheme for Igneous Rock Identification CRYSTAL TEXTURE
SIZE
Obsidian
(usually appears black)
Basaltic glass
non-
crystalline
Non-
vesicular
Glassy
Vesicular
Pumice
Vesicular rhyolite
Scoria
Vesicular basalt
(gas
Vesicular
andesite
pockets)
Fine
Basalt
IGNEOUS ROCKS
ess than
mim
EXTRUSIVE
(volcanic)
ENVIRONMENT OF FORMATION
INTRUSIVE
(Plutonic)
Andesite
Rhyolite
Diabase
Granite
Diorite
Peri-
dotite
10 mm
Coarse
Gabbro
Non-
vesicular
Pegmatite
To mm
arger
Very
coarse
LIGHTER
DARKER
CHARACTERISTICS
LOWER
FELSIC
(rich in SI, AD
100%
COLOR
+ DENSITY +
COMPOSITION
HIGHER
MAFIC
(rich in Fe, Mg)
100%
Potassium
feldspar
(pink to white)
75%
Quartz
(clear to
-75%
volume)
white)
Plagioclase feldspar
(white to gray
(relative DOMPOSITION
50%
-50%
MINERAL
Pyroxene
(green)
Biotite
(black)
25%
Olivine
(green)
-25%
Amphibole
(black)
0%
Physical Setting/Earth Scienne
-0%

You decide that the introduction should also discuss the extremophiles that are referred to as the archaea. these single-cell organisms are considered "extremophiles" due to their ability to survive and reproduce in environmental conditions that would be hostile for most living organisms. archaea species have been isolated from highly acidic sulfur springs, ocean floor thermal vents with temperatures that exceed boiling, and subarctic ice well below freezing. while still considered to be prokaryotic, the archaea have numerous differences that place them apart from the bacteria. choose the characteristics that separate the archaea from other prokaryotic cells. select all that apply. view available hint(s) select all that apply. archaea lack true peptidoglycan in their cell walls. the morphology of the cell is rigid and is geometric in shape, similar to a sphere or cylinder. the cytoplasmic membrane lipids of archaea have branched or ringform hydrocarbon chains. all currently identified and characterized archaea have been linked as the causative agent to an animal or human disease.

Which best describes the scientific method? a. a path of clearly defined steps that must be followed in a particular order b. a possible answer to a scientific question based on knowledge or research c. the recipe for how to conduct an experiment that must be followed precisely d. the process of hypothesis and testing through which scientific inquiry occurs

Crossing over is a method of (blank)?