Question

How do erosion and deposition work together to create a moraine?

Waves cause erosion along coastlines and deposit sand away from the shore.
Surface water in rivers causes erosion, carrying sediment that gets deposited near an ocean.
Glaciers cause erosion as they melt, carrying sediment that gets deposited in a thick layer.
Winds cause erosion by blowing around sand that gets deposited in large piles.

Answer 1

Waves cause erosion along coastlines and deposit sand away from the shore. Surface water in rivers causes erosion, carrying sediment that gets deposited near an ocean. Winds cause erosion by blowing around sand that gets deposited in large piles. ...

Answer 2

Glacial till is found in different types of deposits. Linear rock deposits are called moraines.

Moraines are named by their location relative to the glacier:

Lateral moraines form at the edges of the glacier as material drops onto the glacier from erosion of the valley walls.

Medial moraines form where the lateral moraines of two tributary glaciers join together in the middle of a larger glacier

Explanation:

• Glaciers cover about 10% of the land surface near Earth’s poles and they are also found in high mountains.
• During the Ice Ages, glaciers covered as much as 30% of Earth. Around 600 to 800 million years ago, geologists think that almost all of the Earth was covered in snow and ice.
• Scientists use the evidence of erosion and deposition left by glaciers to do a kind of detective work to figure out where the ice once was.

• Glaciers are solid ice that moves extremely slowly along the land surface  
• Glacial ice erodes and shapes the underlying rocks. Glaciers also deposit sediments in characteristic landforms.
• The two types of glaciers are:

Continental glaciers are large ice sheets that cover relatively flat ground. These glaciers flow outward from where the greatest amount of snow and ice accumulate.

Alpine or valley glaciers flow downhill through mountains along existing valleys.

• As glaciers flow, mechanical weathering loosens rock on the valley walls, which falls as debris on the glacier. Glaciers can carry rock of any size, from giant boulders to silt.
• These rocks can be carried for many kilometers for many years. These rocks with a different rock type or origin from the surrounding bedrock are glacial erratics.
• Melting glaciers deposit all the big and small bits of rocky material they are carrying in a pile. These unsorted deposits of rock are called glacial till.

Glacial till is found in different types of deposits. Linear rock deposits are called moraines. Geologists study moraines to figure out how far glaciers extended and how long it took them to melt away. Moraines are named by their location relative to the glacier:

Lateral moraines form at the edges of the glacier as material drops onto the glacier from erosion of the valley walls.

Medial moraines form where the lateral moraines of two tributary glaciers join together in the middle of a larger glacier