Classification of Rocks
The Theory of Plate Tectonics
How soil forms
How soil forms
Early Earth
100
The look and feel of the rocks surface
What is texture
100
The lithosphere is broken into separate sections called
Plates
100
Is the loose, weathered material on Earth's surface in which plants can grow
Soil
100
Is a dark colored substance that forms as plants and animal remains decay
Humus
100
How long ago did Earth form
About 4.6 billion years ago
200
Particles of minerals or other rocks that most rocks are made up of
What are grains
200
A well-tested concept that explains a wide range of observations
Scientific Theory
200
The solid layer of rock beneath the soil
Bedrock
200
A crumbly, dark brown soil that is a mixture of humus, clay, and other materials
Topsoil
200
What do Scientist think were the first organisms to evolve on Earth
Bacteria-like organisms
300
When studying a rock, geologist observe what three things?
Mineral composition, color, and texture
300
Breaks in the Earth's crust where rocks have slipped past each other.
Faults
300
Is a measure of how well the soil supports the plant growth
Fertility
300
Usually consists of clay and other particles washed down from the A horizon
Subsoil
300
What caused water erosion to begin on Earth's surface
Rain
400
How do geologist describe a rocks texture
The grain size, shape, and pattern
400
A deep valley that forms along the divergent boundary
Rift Valley
400
Is a layer of of soil that differs in color and texture from the layers above it or below it.
Soil horizon
400
The loose layer formed by leaves that have been shed
Litter
400
How did volcanic eruptions and comets change early earth
They released carbon dioxide and water vapor into the atmosphere
500
Name the three classifications of rocks....1. Igneous 2. ? 3. ?
Sedimentary and Metamorphic
500
States that pieces of Earth's lithosphere are in slow, constant motion, driven by convection currents in the mantle
The theory of plate tectonics
500
The organisms that break the remains of dead organisms into smaller pieces and digest them with chemicals
Decomposers
500
The organisms that break the remains of dead organisms into smaller pieces and digest them with chemicals
Decomposers
M
e
n
u