The type of rock taht forms when melted rock cools and hardens.
What is igneous?
100
The remains of decayed plants and animals.
What is humus?
100
What causes sinkholes?
water dissolves underground rock
100
What property do all horizons share?
Partly weathered rock.
100
What is different about where light and dark soils are formed?
Dark soil comes from a place with much humus like a forest. Light soil comes form a place with little humus like a desert.
200
A layer of soil.
What is horizon?
200
The changing of rocks over time.
What is rock cycle?
200
What substance makes up most of the Earth's crust?
What is rock?
200
What are the physical properties of soil?
A) texture B) size of particles C) composition D) color
300
The process of moving sediment to other places.
What is erosion?
300
The bottom layer of soil.
What is bedrock?
300
What are four physical properties of minerals?
A) luster B) streak C)hardness D)color
300
What landforms are formed when two of Earth's plates come together and push against each other?
mountains
400
A solid substance that occurs naturally in rocks or in the ground.
What is mineral?
400
Which layer of soil contains humus?
Top soil
400
What physical property of soil would you test by feeling the soil?
texture
400
How are rocks and minerals alike and different?
Minerals are found in rocks. There are more than 4,000 minerals. Rocks are classified in three groups. Rocks are made of minerals. They both are a solid found in nature.
500
The breaking down of Earth's surface into pieces.
What is weathering?
500
What three processes contribute to the weathering and erosion?
1) plants 2) wind 3) waves
500
How do you test for streak?
rub the rock over a streak plate. Observe color.
500
Name each group of rocks and tell how each type is formed.
Igneous: form when melted rock cools and hardens.
Sedimentary: form from sediment piled up in layers over time.
Metamorphic: formed from any other rock under heat and pressure.