Download DE pg 101

7th gr science
Dynamic Earth (pg. 101-104)
Name:

 Made of weathered rock particles (sediments).
 Sediments: mud, sand, pebbles, shells, bones, leaves, stems, & remains of living things
 Over time, they are pressed and cemented together to make rocks.
Clastic Rock
Made from pieces of old
rocks.
Organic Rock
Made from once living things.
Grouped by size & shape of
Ex:
the pieces.
Limestone:
Ex:
 Made of calcite or calcium
Conglomerate:
carbonate.
 More than 1/3 of rock
 Usually organic, because
made of pebbles.
may be formed from
 Cemented by clay, mud, &
shells of sea animals.
sand.
 Chalk is soft limestone
 Pebbles are smooth &
round, because they are
Coal:
weathered by water.
 Made from dead plants
 Also called puddingstone.
 Breccia – sharp/angular
Sandstone:
 ½ of rock made of sand
near water & cemented by
minerals.
 More weathered than
conglomerate, so more
common.
Shale:
 Made of clay & silt that
settle to the bottom of
quiet water (like swamps).
 Can have dead plants &
animals in it.
 It can be split into flat
pieces.
Chemical Rock
Made when a sea or lake
dries and leaves minerals.
Ex: Rock salt, Gypsum
Limestone:
 Formed by minerals
dripping in caves or
 chemical changes in the
ocean.
 They are chemical not
organic