Rocks 1
Rocks are made up of ____________?
minerals
Rocks that are formed from material that has settled into layers are called __________.
sedimentary
___________ is a rich mixture of decomposed remains of plants and animals.
humus
____________ is the breaking down of rock into smaller pieces.
weathering
The best kind of soil for plants is a mixture of silt, sand, and clay. It is called _____________.
loam
If a rock has very tiny particles that cannot be seen with the eye, they are called __________ grained.
fine
Rocks that have been changed from one type to another by heat and pressure are called _________.
metamorphic
How many layers of soil are there?
3
Name an example of weathering:
ice, wind, water
A mixture of minerals, air, water, and humus is called _____________.
soil
___________ describes how much light a rock reflects.
luster
Rocks that form from a volcanic explosion are called ______________.
igneous
The deepest layer, this layer is where soil comes from.
bedrock
____________ happens when soil, rocks or sand are moved.
Erosion
Quartz is one of many______________ because it is a nonliving solid with a crystal form.
minerals
The _____________ scale is used to classify a rock's hardness.
Mohs
Name the softest and hardest rocks:
talc, diamond
Name the three types of soil that we looked at:
sand, clay, silt
Explain how tress can both cause and prevent erosion.
Tree roots and hold on to dirt allowing it to stay in place and not be washed away by water or wind, but roots can also break rock into smaller pieces which are easily carried away by water or wind.
To grow, plants need water, light and _____________ from the soil.
nutrients
Name 3 properties of minerals:
hardness, color, streak
Why are rocks in a stream usually smooth?
the moving water wears them down
Which type of soil does not hold water well?
sand
What are some ways that humans can prevent erosion?
plant trees, bushes, grass, etc., build retaining walls, keep natural areas natural
If you put some brick pieces, sand, and water in a jar and shook it everyday for two weeks. What might you notice happening?
weathering