Rocks
Hard pieces of earth's surface is called....
Rocks
Soil is made of small bits of broken rock, air spaces, ____________ and ____________
humus and water
Some properties that can be used to identify a mineral are crystal shape, color, streak and....
Hardness
Minerals
Natural resource that is made up of small bits of broken rock, air spaces, water and humus
Soil
Rock that forms when layers of sediment are pressed together and harden is ____________ rock
sedimentary rock
Layer of soil that has large, unbroken rock is called....
Bedrock
Table salt is a mineral that is easy to find. It is called a __________mineral
common
The remains of a living thing that has died and was buried quickly is a ......
Fossil
The remains of living things that have died and decayed become....
Humus
Scientists classify rocks by.....
How they are formed
Looking on page 56: list the layers of soil from top to bottom
topsoil, subsoil and bedrock
Gems are minerals that are hard to find. They are called ____________minerals
precious
The layer of soil that has larger pieces of rock than and contains less humus than topsoil is......
subsoil
Layer of soil that contains humus and is where plants grow is the....
top soil
Igneous
List 2 causes of erosion:
wind and flowing water
Rocks are made of one or more....
minerals
The rapid downhill movement of a large amount of rocks and soil is called a....
landslide
weathering
Forms when Sedimentary and igneous rocks are changed by great heat and pressure....
Metamorphic rock
List 2 causes of weathering:
Flowing water, plants, ice and wind
When none of a certain kind of plant or animal are still alive, the plant or animals is....
extinct
When plants and animals decay they......
break apart or rot
Movement of rocks and soil is called...
Erosion