Shared Flashcard Set

Details

Earth Science
Rocks, Minerals, Soils, and Fossils
18
Science
3rd Grade
01/04/2015

Additional Science Flashcards

 


 

Cards

Term
rocks
Definition
are made from minerals
Term
igneous
Definition
"fire made" form when melted rock cools and hardens; granite, basalt
Term
sedimentary
Definition
form when sand, mud, and pebbles at the bottom of rivers, lakes, and oceans pile up; over time they press together and cement into solid rocks; limestone and siltstone
Term
metamorphic
Definition
rock that has changed form through squeezing and heating; marble and gnesis
Term
weathering
Definition
the process that crumbles, cracks, and breaks rocks; happens slowly over several years; can occur by water, wing, and temperature
Term
erosion
Definition
occurs when weathered materials are carried away; is a slow process
Term
soil
Definition
is made of many different materials including rocks, minerals, and silt
Term
humus
Definition
can be found in soil; it is a material that was once living or was formed by living things; it adds nutrients to the soil
Term
topsoil
Definition
top layer of soil; made of very small, dark particles; has a lot of humus and minerals; it can also hold a lot of water
Term
subsoil
Definition
found below the topsoil; made of bigger, lighter colored particles; lacks humus; hold water and some minerals
Term
bedrock
Definition
found below the subsoil
Term
loam
Definition
kind of soil with clay and sand
Term
silt
Definition
soil with grains of rock that are too small to see with your eyes alone
Term
fossil
Definition
the imprint or remains of something that lived long ago; teeth, bones, shells
Term
amber
Definition
hardened tree sap; fossils can be found in amber
Term
imprints
Definition
shallow prints or marks in solid rock
Term
molds
Definition
an empty space in rock where something once was
Term
cast
Definition
a fossil made inside a mold; a copy of the mold's shape
Supporting users have an ad free experience!