Quiz 1 (Interlude A+Ch 4)

Question 1

what must rocks be?

Answer 1

coherent

naturally occuring

aggregate of minerals or mass of glass

Question 2

Types of rock

Answer 2

igneous: freezing of molten rock
sedimentary: cementation of grains or precipitation of minerals from water solution
metamorphic: preexiting rock changed due to change in temperature, pressure, or chemical environment

Question 3

where do igneous rocks form?

Answer 3

volcanic arc

mid-ocean ridge

Question 4

where do sedimentary rocks form

Answer 4

deep ocan and subduction zones

passive margins

rifts

Question 5

where do metamorphic rocks form>

Answer 5

between subduction zones and volcanic arcs

mountain belts

Question 6

Composition of rocks

Answer 6

grain size and shape

size: fine to coarse
shape: equant and inequant

composition of chemicals therefore minerals

texture
configuration and interlocking of grains

layering
created by bands of different compositions and textures
bedding: sedimentary
morphic foliation: metamorphic

Question 7

Studying rocks

Answer 7

thin sections

for deeper study, scanning electron micrscope, electron microbe, mass spectrometer, x-ray diffractometer