Vocabulary
Soil
A mix of humus, sand, silt, clay, gravel, and/or pebbles.
Breaking apart of rocks is called...
Weathering
What layer are fossils the oldest?
a. top layer
b. middle layer
c. bottom layer
a. top layer
Erosion is caused by _____, _____, and _____.
Erosion is caused by water, wind, and ice (glaciers).
Erosion
The carrying away of weathered earth materials by water, wind, or ice.
Tree rings, fish fossils, and ice core/glaciers are all evidence that indicate _____________.
Tree rings, fish fossils, and ice core/glaciers are all evidence that indicate that life and environmental conditions have changed.
How can you tell if an area of land was once covered by water?
The fossils found lived in water.
Two events that can change the land quickly are ______.
Floods, Volcano Eruptions, Earthquakes
Deposition
The settling of sediments.
What type of soil will settle sooner when traveling down the river?
Larger and heavier earth materials
Fossils provide _________ of organisms that lived long ago.
evidence
A light rainfall changes the Earth's surface in a 1.______ way, while a heavy flood changes the Earth's surface in a 2.______ way.
1. Slow
2. Fast/Quick
Physical Weathering
The process by which rocks are broken down by breaking and banging.
Name 2 Earth events that can cause rapid changes in landforms
Volcano eruptions, landslides, earthquakes, or floods
How do scientist determine the age of a fossil?
Compare them to other fossils
Water erodes most quickly when it ________.
Runs downhill (slope)
Chemical Weathering
The process by which the minerals in a rock can change due to chemicals in water and air.
Rocks can be moved during a process that is called 2.__________. Once they are moved to a new location, during 3._________, those rocks are in their new resting place.
1. Erosion
2. Deposition
Fossils give clues to changes in the __________.
Organisms trapped in sediments can become _________.
Fossils