Page:LA2-NSRW-5-0242.jpg



THE STUDENTS  MANUAL

(1) Unstratified rock:

HI. PHYSICAL NATURE STUDY:

1. STUDY OF ROCKS:   Geology 747; Evolution 636.

a. The main kinds of rocks in the earth's crust:

(a) Granite, rock made up of crystals

— mainly quartz:  1571;   792; 653;  1036.

1. The "hard-heads" of the fields: 553.

(b) Trap   rock,  dark,   granular  rock:

1938; 177.

1. The Palisades of the lower Hud-;                son River:   1938; 894; 1571.

(a) Sandstone, rock made of grains of

sand  held   together  by  a cement:    1673;   1674.

1. Notice   the   material   of  which

gravel   stones    are    made: sand 1673; gravel 796.

2. "Brown   stone"   houses:     Ohio

1374; sandstone 1674.

(b)  Limestone,   composed   mainly   of

lime:  1072.

1. "Flag stone": 1773; chalk 363; limestone ledges 1072; marble 1167.

(c)  Shale,    a    finely    stratified    rock

made  from    mud    and    silt: 1733; 406.

(d)  Slate,   a   clay   rock   made    from

shale by great heat: 1733. 1. Slate   roofing:    pencils    1444; slates 1733.

(e) Clay, mainly from the decay and

powdering of ©ther rock: 406. 1. Brick and potter's clay:   1538; 265.

(2) Stratified rock —which ^ is in layers:

b. The making of rock:

(1) igneous rock, rock which has been mol-ten, unstratified:

(2) Sedimentary   rock stratified:

'(a) The first rock of the earth:  638;

1529;  747.

(b) Granite:   792;    trap   rock   1938;, hardened lava 1036.

(a)  Made from material deposited by

water in the ocean, lakes and beds of streams: shale 1733; sandstone 1674; limestone 1072.

(b)  How the   material   Is  broken   off

and worn away from the older igneous rock: sand 1673; Sahara 1654; earth 574; drift 553.

(c)  How the  material   is carried   by

water: alluvium 53; earth 574; chalk 363.

(d)  How   the   material   Is  deposited:

sand 1673; earth 574; alluvium 53.

(e) Cementing    of   the    particles   to-

gether by lime anil silica: pebble 1437; shale 1733; silica 1757; lime 1071.

1. Effect of heat in this:  mineralogy 1231; lime 1071.

2226