Which letters represent a MORAINE?

• A & B

• A & C

• C & D

• B & D

Answer explanation

A moraine is material left behind by a moving glacier. This material is usually soil and rock. Just as rivers carry along all sorts of debris and silt that eventually builds up to form deltas, glaciers transport all sorts of dirt and boulders that build up to form moraines.

What is an alluvial fan?

• is where the magma comes through the plates

• is where the water freezes

• is a triangle-shaped deposit of gravel, sand, and even smaller pieces of sediment, such as silt.

Answer explanation

https://education.nationalgeographic.org/resource/alluvial-fan/

An alluvial fan is a triangle-shaped deposit of gravel, sand, and even smaller pieces of sediment, such as silt. This sediment is called alluvium. Alluvial fans are usually created as flowing water interacts with mountains, hills, or the steep walls of canyons. Streams carrying alluvium can be trickles of rainwater, a fast-moving creek, a powerful river, or even runoff from agriculture or industry. As a stream flows down a hill, it picks up sand and other particles—alluvium. The rushing water carries alluvium to a flat plain, where the stream leaves its channel to spread out. Alluvium is deposited as the stream fans out, creating the familiar triangle-shaped feature. The narrow point of the alluvial fan is called its apex, while the wide triangle is the fan's apron.

What is a Delta when discussing streams?

• desert areas that form when streams empty.

• wetlands that form as rivers empty their water and sediment into another body of water, such as an ocean, lake, or another river.

• a change in the stream that causes it to freeze.

Answer explanation

https://education.nationalgeographic.org/resource/delta/

Deltas are wetlands that form as rivers empty their water and sediment into another body of water, such as an ocean, lake, or another river. Although very uncommon, deltas can also empty into land.

A river moves more slowly as it nears its mouth, or end. This causes sediment, solid material carried downstream by currents, to fall to the river bottom.

Alluvial fans and deltas are sedimentary landforms deposited by flowing water. Deltas are formed by continuous flowing water, while alluvial fans are often found where intermittent streams flow. Although deltas and alluvial fans are deposited in different environments, they are similar in shape and process of formation. Select the answer that correctly orders the process that eventually results in the formation of a landform:

• decrease in the energy of water

  widening of the channel

  thickening of deposits

  Sedimentation

• Sedimentation

  decrease in the energy of water

  widening of the channel

  thickening of deposits

• widening of the channel

  decrease in the energy of water

  Sedimentation

  thickening of deposits

 Deltas sometimes form where rivers meet large bodies of water. What role does the movement of the water have on the formation of deltas?

• Sediment falls out of water when a fast-moving river slows down after it meets a large body of water.

• Sediments are carried by fast-moving water far into a large body of water.

• Sediments are picked up where a river meets a large body of water and are carried away.

• Sediment falls out of water when a slow-moving river speeds up after it meets a large body of water.

what is the difference between a stalactite and a stalagmite?

• one forms in caves and one forms in streams

• one forms from the top and one forms from the bottom

• they both form in caves

Answer explanation

When discussing mineral formations in caves, we often talk about stalactites and stalagmites. A stalactite is an icicle-shaped formation that hangs from the ceiling of a cave and is produced by precipitation of minerals from water dripping through the cave ceiling. Most stalactites have pointed tips. A stalagmite is an upward-growing mound of mineral deposits that have precipitated from water dripping onto the floor of a cave. Most stalagmites have rounded or flattened tips.

what caused this to form?

• gravity

• water

• wind

• humans

Answer explanation

the wind causing this rock to be shaped like that is an example of wind weathering (the breaking down of the rock).

what caused this?

• gravity

• water

• wind

• plants

Answer explanation

roots grow through rocks eventually breaking them down to create soil.