The organism that breaks down and digests the remains of dead organisms is...
What is a decomposer?
100
An igneous rock that formed from lava on earth's surface.
What is an extrusive igneous rock?
100
When all the grains in a rock are large and easy to see, the rock is described as...
What is coarse grained?
100
The process by which sediment settles out of the water or wind carrying it is...
What is deposition?
100
The most abundant intrusive rock in the continental crust is...
What is granite?
200
The type of soil loam is made up of.
What is nearly equal amounts of silt, sand and clay?
200
Where a metamorphic rock would formed.
Where is deep underground?
200
To describe a rock's texture, geologists determine...
What is the size, shape, and pattern of the rock's grains?
200
Most of the work of mixing humus within the soil is done by...
What are earthworms?
200
This is the layer of soil that you would find the most decomposers.
What is the A horizon?
300
The B Horizon layer consists of...
What is clay, minerals, and little humus?
300
Sedimentary rocks that are made up of broken pieces of other rocks.
What are clastic sedimentary rocks?
300
A metamorphic rock that has grains arranged in bands is said to be...
What is a foliated metamorphic rock?
300
Dissolved minerals and particles of sediment stick together to form sedimentary rock in a process called?
What is cementation?
300
This is how rocks and minerals are related.
What is rocks are made up of one or more minerals?
400
The loose layer of leaves on the surface of the soil.
What is litter?
400
An igneous rock that cools very quickly when it forms may have a texture that is...
What is smooth and shiny with no visible grains?
400
Geologists use these characteristics to identify a rock.
What are the rock's mineral composition, color, and texture?
400
Soil formation would take place most rapidly with the weathering of: a. granite in a cold, dry climate b. limestone in a desert c. limestone in a warm, wet climate
What is limestone in a warm, wet climate?
400
The difference in how rocks and minerals are classified.
What is rocks are classified by the way they form and minerals are classified by their physical properties?
500
This layer of soil contains some weathered rock.
What is C horizon?
500
A sedimentary rock that forms where thick layers of plant and animal remains are deposited.
What is an organic sedimentary rock?
500
Soil that has a lot of humus, or contains many nutrients plants need to grow is said to be...
What is fertile?
500
As layer upon layer of sediments are deposited, this process presses them together.
What is compaction?
500
Describe two ways burrowing animals enrich soil with the substances that plants need to grow.
What is 1. mix the humus through the soil; 2. add nitrogen to the soil from waste; 3. add organic materials when they die and decay; and 4. mix air into soil.