Glaciers
What conditions are needed for a glacier to form?
Cold temperatures that are enough to compacts into ice
What is till?
Unsorted sediment deposited directly by a glacier.
What causes metamorphic rocks to form?
Heat & pressure
Which process is responsible for carving U-shaped valleys?
Glacial erosion plucking and abrasion
Igneous rocks form from ______ rock that cools
Molten or Lava or magma
Why do glaciers start to move downhill?
gravity and the weight of the ice causing it to flow.
How does a moraine form?
ccumulation of glacial till at the edges or end of a glacier.
Why do intrusive igneous rocks have large crystals?
cool slowly underground, allowing crystals to grow large.
What type of sediment is found in a moraine?
Till
Sedimentary rocks often form in ______ environments
The following: Water, Rivers, lakes, oceans, depositional
What shape of valley is formed by a glacier?
U-shaped valley
What is a drumlin?
A smooth, elongated hill formed by glacial ice
What two steps form sedimentary rocks?
Compaction & cementation
A drumlin’s shape shows what about its formation?
The direction of glacier movement
TWO PART QUESTION: Metamorphic rocks change due to ______ and ______
Metamorphic rocks change due to Heat and pressure.
Name one piece of evidence that New York State was shaped by glaciers.
Glacial striations, moraines, drumlins, or erratics.
How does a kettle lake form?
When a block of ice is buried in glacial sediments and melts, it leaves a depression that fills with water.
Why are fossils commonly found in sedimentary rocks?
Sedimentary rocks form at low temperatures that preserve organic material.
Which landscape feature forms when buried ice melts?
Kettle lake
TWO PART QUESTION: Weathering ______ rock; erosion ______ rock.
Weathering Breaks down; erosion moves rocks
explain how glaciers can both erode and deposit material
Glaciers erode land by plucking and abrasion, and deposit material as till, moraines, and other sediments.
why might erratic and be formed far from its original bedrock?
deposited by a glacier, often far from its source.
What are the three major rock types?
Igneous, sedimentary, and metamorphic
What is the main agent responsible for transporting erratics?
Glaciers
A glacier can carry rocks far from their origin and drop them as
Erractics