Test 2 Additional questions Flashcards Preview

Soils II > Test 2 Additional questions > Flashcards

Flashcards in Test 2 Additional questions Deck (46)
Loading flashcards...
0

What is meant by melange?

Term describing disruption of rock at subduction zone where one peice of crust is consumed by another

1

What is meant by Thrust fault?

When layers of rock collide and one layer is "thrusted" over the other resulting in the exposure of very old rock at the surface.

2

How was the omnicea formed?

Result of a plate collision where high pressures metamorphosed huge masses of granite and igneous rock.

3

whats a fault?

Where tectonic plates collide

4

Which reacts more violently to acid? Limestone or DOLOMITE?

limestone

5

What is meant by aphanitic?

Fine grained

6

What is meant by phaneritic?

coarse grain

7

What is meant by poryphyritic

Large crystals locked together with smaller crystals

8

What is meant by pyroclastic?

Composites of ejected volcanic fragments

9

What two groups are sedimentary rocks separated into?
explain the basis of differentiation

Clastic - composed of fragments from pre-existing material

Chemical Precipitate - minerals Precipitate out of water and settle to the bottom

10

What are the two types of micas?

Biotite - ferro magnesium
Muscovite - non ferro magnesium
Form at cooler temperatures

11

What are the two types of feldspar?
Differentiate

Orthoclase - Pink colour - non striated
Plagioclase - light or dark - striated

12

What is the texture of extrusive rocks?

What about intrusive?

Extrusive - Aphanitic

Intrusive - Phaneritic

13

What are the macro nutrients that come from the atmosphere?

Rocks?

H,C,O,N

P,K,Ca,Mg,S

14

Name some micro nutrients

Cl, B, Fe, Mn, Zn, Cu, Ni, Mo

15

What is andesite?

-Fine grain
-Igneous Extrusive
-Mainly plagioclase with other minerals like hornblende/pyroxine/biotite

16

What is Rhyolite?

-Light coloured
-igneous extrusive
-Similar to granite in composition (Quartz+Feldspar)

17

What is Basalt?

-Igneous extrusive
-Fine grain
-Dark colour
-Formed by quick cooling of magma at surface of earth
-Similar to Gabbro in composition (plagioclase/pyroxine/olivine)

18

What is Obsidian?

-Igneous extrusive
-forms when molten rock cools so rapidly that atoms do not have time to arrange themselves into crystal structure

19

What is Gabbro?

-Igneous intrusive
-black/dark green
-similar composition to basalt but forms deeper (Plagioclase/augite/olivine)

20

What is Granite?

-Igneous intrusive
-Mainly quartz and feldspar
-Slow cooling of lava beneath earths crust

21

What is Diorite?

-Igneous intrusive
-light colour
-similar to andesite but formed deeper in the earth
-(plagioclase/biotite/hornblende)

22

What is limestone?

-Clastic sedimentary
-Formed primarily from the organic accumulation of shell and coral debris

23

What is conglomerate?

-Clastic sedimentary
-Composed of compacted/lithified gravel size fragments of weathered material

24

What is Dolomite?

- Sedimentary chemical precipitate
- Similar to limestone but less reactive to acid
- Light colour
- reacts with acid

25

What is sandstone?

- Clastic sedimentary
- accumulation and lithification of sand sized particles

26

What is Shale?

-Clastic sedimentary
-Accumulation and lithification of clay sizes weathering debris
-generally dark colour

27

What is siltstone?

-Clastic sedimentary
-accumulation and lithification of silt sized weathering debris

28

Differentiate conglomerate and breccia

conglomerate has rounded fragments
breccia has angular fragments
-Both clastic sedimentary

29

What are metamorphic rocks?

Igneous or sedimentary rocks that have been subjected to intense heat and pressure by tectonic activity or contact with lava