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Deltas are usually triangular-shaped layers of rock. Some are all wonky on the edges but they are all kind of triangular. They are built constructively and usually take about 5,000 years to form. (That's a LONG time!) The way deltas are formed is by rivers carrying sediment and then dropping it. Over time, layers of rock are formed into deltas. They are usually near the mouth of large rivers.

Cite:
https://www.nps.gov/articles/delta-landforms.htm
http://www.onegeology.org/extra/kids/earthprocesses/deltas.html
https://www.nationalgeographic.org/encyclopedia/delta/

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A dune is a mound of sand formed by the wind, usually along the beach or in a desert. Dunes form when wind blows sand into a sheltered area behind an obstacle. A dunes windward side is the side where the wind is blowing and pushing material up.  The forces that make dunes are...
Wind – sand transported by the wind creates sand dunes.
Water – bits of soil and rock can be carried downstream and deposited causing deltas.
The process of making a dune can happen in less than a month if conditions are right. The mineral that is binding the sand could have precipitated last month, 100 years ago, 1000 years ago, or 10,000 years ago, and that is what determines the age of the rock. Sand dunes are a constructive force.
Generally speaking, there are five main types of sand dunes:

1.  transverse

2.  linear/longitudinal

3. star

4.  barchan/crescentic

5.  parabolic/blowout.

Their are other ones, as shown in the photo.

Sources:https://www.nationalgeographic.org/encyclopedia/dune/

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By: Peyton
How are they made?

Hoodoos are made when a hard rock covers a soft rock, overtime the hard rock will weather away taking bits at a time.
Then all that is left behind is a tall structure. It can take thousands of years to completely form! It is a slow and destructive change!

What forces created it?

The forces that are used to create a Hoodoo are weathering and erosion!

What are the special features?

The special features of a Hoodoo are its long and rounded structure. Even though it gets bigger the higher it goes they are sturdy!

Sources used!!
National Web
CanyonRides.com
and Livescience.org

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Sky Fine
A trench is formed by two or more tectonic plates pushing against each other. The older, denser plate is pushed deep into the mantle underneath the lighter one. This makes the crust bend and make a steep V shape. This process is called subduction.  This is a slow, destructive force. Trenches are long, narrow, and deep dents in the crust. Marianas  Trench is the deepest known spot on earth reaching 35,814 feet below sea level

sources: OCEANOGRAPHIC
NATIONAL GEOGRAPHIC
U.S DEPT OF DEFENSE

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Allie B
They are formed by erosion when water has been washed up by small or soft rocks that are not near the top or on the top of a mesa. A mesa are usually dry

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a crater is a bowl - shaped  depression , or hollowed - out  area, produced by the  impact of a  meteorite, volcanic activity, or an explosion .  or a const Crater, astronomy : a constellation that is visible between the constellations of Corvus and Hydra and that is represented by the figure of a cup as  a  large bowl seen on  earth   or the moon

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by nick

A river delta is a land form created by deposition of sediment it is slow to make one A Delta is a constructive deltas' greatest importance to human activities, fish and wildlife

delta | National Geographic Society

River delta - Wikipedia

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Hills are formed because of a erosion, which happens when bits of rocks, soil, and sediment get washed away and placed in a pile somewhere else. www.nationalgeographic.org
It takes tens of thousands of thousands of years to form. scienceline.ucsb.edu

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A volcano is formed when molten rock, ash solidify as they cool, forming the distinctive volcano shape when the lava cools and hardens, it forms into the cone shaped mountain we think of as a volcano. Most of the world's volcanoes are  are found under the edges of the tectonic plates, both on land and in the oceans. On land, volcanoes form when one tectonic plate moves under another.
(www.onegeology.org)
-Josie

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(Sophia Dupre) Special features that make a canyon a canyon are that they are tall, steep, and narrow but not as narrow as  a Gorge, canyons take millions of years to create as well. Another feature of them that are special is that they usually have water flowing through it. The movement of rivers cause weathering and erosion which make a canyon (destructive). A canyon is a deep valley that are originally cliffs but cut by erosion.
RESOURCES-https://www.nationalgeographic.com/science/earth/surface-of-the-earth/canyons/

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a gorge is a narrow valley with steep rocky walls it is as tall as a valley and as deep as a valley a gorge is smaller than a canyon and sometimes it is full of water or just damp and it is in wet places most of the time it is made from water and it really is  and it goes through and breaks the rocks and makes the gorge  and it is a good spot for animals because there a little holes that they can fit in gorge you glad that i told you about this. and they are great trails for people to you know hike and bike and spike

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An island is a landform as volcanoes erupt they build islands.A volcano slowly forms and constructs over time .  An island is completely surrounded by water.  https://www.usgs.gov/centers/pierc
https://www.islandstudies.ca/

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landon ;-;-;-;-;-;-;
a butte was created by erosion a butte is flat topped and it has steep edges a butte is aka a mesas or a plateaus a mesas is different from a butte because a butte is bigger

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A fjord was created by glaciers moving very slowly and made by destructive forces.
Some special features that make a fjord what it is that "it is a deep, narrow and elongated sea or lake drain,  with land on three sides.Fjords are big U shaped bodies of water
Sites-www.natinalgeographic.com and www.fjordnorway.com

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Brookson
A valley is made of deeper stream of water that flows from high land to low land, into a lake or a sea. Some are made by glaciers.
A valley is created by running river s and shifting glaciers.
A valley is special because valleys have important place for people because of there presents close to rivers.

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Cashlyn :D

A cliff is made by erosion along with weathering.  The reason its formed by weather is because it has natural things that happen like wind and rain or broken down rocks. The left over peaces if rock help create a cliff.  A cliff is the mass of a rock that rises very high  it almost looks vertical!!  It also looks straight up and down . They form by the ocean near high mountains or the walls of a canyon.

Sources: https://www.nationalgeographic.org/encyclopedia/cliff/#:~:text=Cliffs%20are%20usually%20formed%20because,rocks%20are%20left%20as%20cliffs.

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Areches are formed by weathering and erosion and the rocks stack and stump.
Arches are formed from fast forces an fast waves when a river or a stream over flows  and hits the rocks but soe arches are on mountains .
The sea, rivers, and weathering makes arches because of how the water floods and it hits the rocks so hard it creates an arch

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A Plateau is formed by a different number of processes including volcanic magma, explosion of lava, and erosion of water and ice.

A Plateau is a destructive landform.

A Plateau takes millions of years to formed by different number of processes, including volcanic magma, explosion if lava, and erosion of water and ice.

Some special features of a Plateau are it is very flat.
Some Plateaus are formed by mini volcanic eruptions.
Some Plateaus are formed by lava flows.

https://courses.lumenlearning.com/

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A Penninsula is formed by rising or falling sea levels that can expose or cover parts of land. A rise or fall of landmass can help form a penninsula. A Penninsula is slow and destructive because a penninsula is most likely formed by waves that crash on the rocks and that forms the U shape. So in conclushion a penninsula takes a slow time to form and is destructive. One special feature a penninsula has is a penninsula is connected to the mainland on one side.http://worldlandforms.com/landforms/peninsula/#:~:text=How%20are%20Peninsulas%20Formed%3F,years%20can%20create%20a%20penisula.

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An archipelago is created by underwater volcanoes and it takes a while to happen. An archipelago is a slow change because it takes a long time for a bunch of islands to be created.An archipelago is a constructive change because when the underwater volcanoes erupt it forms an island.An archipelago could be a destructive change too, because of glacier melting. An archipelago is just an area with a lot of islands in it, close together. Hawaii is an archipelago. So far the Malay Archipelago is the biggest archipelago, with around 25,000 islands in it. This archipelago was actually formed by a glacial retreat/flooding. An archipelago can form in an ocean, but can form in a lake or river if there are tiny islands close together. Most archipelagos are oceanic islands. oceanic islands are islands that are formed by underwater volcanoes. A group of oceanic islands are called an island arch. Japan is an island arch. Not all archipelagos are made from volcanoes. Some archipelagos are formed when glaciers melted and overflowed valleys.
Sources: https://www.nationalgeographic.org/

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A mountain is formed by earths tectonic plates smashing into each other.mountains are constructive because they are made by tectonic plates smashing and building up.Mountains rise at least 1,000 feet or more which is why they are a landform.
britannica.com

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A Delta is made by deposition sediment, and a Delta created river dominated, wave dominated, and a tide dominated and a Delta is a constructive forced because erosion takes broken sediment. The special features of a Delta is A Delta extends a river"s mouth into the body of water into which it is emptying.

cite: National Geographic Society and my sources