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Every specific group of blocks purposefully formed in Minecraft based on coding is a natural structure.

Current

Natural Structures currently in Beta 1.7.3.

Hills

File:2011-06-26 12.22.17.png

A randomly-generated hill with some flowers and trees.

Hills are randomly generated pieces of land in the map. Like stairs, hills are always traversable to their highest point by virtue of the algorithm which generates them; there is always a place on each level from where the next level can be accessed, meaning that the player can climb a hill one level at a time until they reach the top.

Cliffs

File:2011-06-26 12.32.48.png

Some cliffs.

Cliffs are carved into hills, and sometimes have caves protruding into them. These caves contain the same blocks which one would find at the same layer in the hill they are carved out of. This may include Ores, Stone, Gravel, Sand, Sandstone and Dirt.

Floating "Islands"

File:2011-03-07 06.23.06.png

It is rare to see a naturally occurring, large, floating "island." This one is on the pre-generated seed "Glacier"

Floating "islands" are structures that float in midair that are not connected to the to the ground, the sea, hills or cliffs. Floating "islands" are normally just random pieces of floating dirt found near cliffs, but on rare occasions they can be large, floating structures that even have springs and trees on them.

Oceans

File:2011-06-26 12.21.28.png

An open Ocean with a couple islands in the distance.

Seas/oceans are huge bodies of water with every single water tile being a spring.

As of Beta 1.8, oceans will be much larger and have their own biome.[1]

Beaches

Sand beach 2

Usual sand beach

Gravel beach

Gravel beach

Beaches usually generate next to oceans or lakes and cover all nearby low elevated shoreline. They come in two varieties: sand beach and gravel beach. Sandstone is located below sand in sand beaches. Gravel beaches have no such border and thus pose danger of falling to cavern located right underneath.

Lakes

Lake2

A lake after the 1.2.6 update compared to the sea level. Since sometime around the Beta 1.2 update, these seem to be much more common than they were before.

File:2011-06-26 12.39.36.png

A rarer lake of lava after the 1.2.6 update. Since sometime around the Beta 1.2 update, these seem to be much more common than they were before.

BedrockLake

A lake found at Bedrock, replacing the bedrock with water.

File:2011-06-26 12.25.28.png

A water lake in a snow biome, which is freezing.

Lakes are geographical features of the map which occur where the level of the land drops below ocean level. Lakes are large bodies of water in which the player is able to swim, and are a large collection of water spring blocks.

Note: As of the 1.2.6 update, lakes can now be generated above sea level or inside caverns, and are small bodies of water surrounded simply by dirt, when in a winter biome, these small lakes are never initially frozen, but can turn to ice when it snows. These lakes can also be composed of lava; however, lakes of lava are more rare. It seems as of beta 1.2, lava lakes found at the surface will be surrounded by gravel, stone, and coal ore.

It is possible for lakes to generate at Bedrock, and the water will replace the bedrock. Lava lakes formed at Bedrock Level will have 1 meter thick stone beneath it. This stone can replace the bedrock at level zero, thus allowing a player to mine through into the void. It appears that when a lake is generated, it is generated after all existing terrain around it has formed.

This would explain oddities such as sugar supported trees, floating trees and sand, and why fires erupt around lava lakes.

Springs

File:2011-06-26 12.33.28.png

A lava spring fall from a mountain side.

File:2011-06-26 12.33.04.png

A water spring fall from a cliff.

Springs are randomly generated blocks of either Lava or Water that act as a source of their respective material. While both can be found on the vertical side of stone blocks above the surface, lava springs are more often found underground beneath layer 32 in Caverns. Both of these sources can be collected and repositioned via the use of Buckets. When coming into contact, Water will turn Lava springs into Obsidian; however, if the Lava is not a spring, it will form only Cobblestone. Springs can only be found in Alpha, Beta, and Infdev. Fluids behave differently in older versions.

Trees

Newtrees

A variety of tree types.

Trees are the structures created both by the automatic generation of the map, and by players (they grow from saplings). They are built out of trunk blocks and leaves. When generated by the map, they are frequently found in groups, in the style of a forest. Trees can range from small trees, often found in groups, to large trees that may require multiple minutes to harvest. Recently in Beta 1.2 Birch trees and pine trees may be found, and in Beta 1.5 birch and pine saplings were introduced. Pine trees have so far mainly only been found in snow biomes. See the tree article for more information.

Caverns

Darkcavern

A dark cave.

Caverns are caves and tunnels that are automatically generated under the ground in various places. They can be useful for several things, such as finding dungeons, and creating underground structures. Caverns are composed mostly of stone, but frequently contain gravel, dirt, bedrock, water, lava, and small amounts of ores, sand, and snow, (depending on your biome).

Mineral Veins

File:Gold Vein.png

A Gold vein in Survival Test.

A Mineral Vein is a natural deposit of ores. Players can come across these veins in caverns, mines, or anywhere there is stone. Six ores can be found in the game, these include Coal, Iron, Gold, Redstone, Lapis Lazuli, and Diamond. When mined with a pickaxe, some ores (gold and iron) will drop an associated item or a block that needs to be smelted in order for it to be crafted into items or blocks. Others (Lapis Lazuli, coal, redstone and diamond) will drop items that can be used immediately.

Dungeons

File:Dungeon.png

A dungeon with a Mob Spawner in the center and two chests.

Dungeons are small, mostly underground, one-room spaces bordered by Moss Stone and cobblestone, and typically contain chests with some satisfactory loot and a hostile Mob Spawner in the center, which guards the chests. Dungeons are often open to a cave, or more rarely even to the surface. Dungeons are the only place to find apples, saddles, Mob Spawners, Cocoa Beans and Moss Stone.

Future Structures

In Beta 1.8, there will be various new Natural Structures.

Rivers

NotchRiver

A game-generated river.

In 1.8, there will new rivers, revealed by Notch. Not much is known about these new additions to the terrain.

NPC Villages

PqYck

A picture of an in-game NPC Village.

NPC Villages are new structures to be in 1.8. They will have wells, smiths, farms, and town borders.

Underground Ravines

Ravine

An Underground Ravine, shown in this screenshot.

Underground Ravines are an upcoming structure. They will also be called canyons if found on the surface.They will also have ledges to walk on.

Strongholds

Unnamed Brick Blocks

The first picture of a stronghold.

Strongholds are an upcoming structure in the 1.8 update. They are a new type of structure that seems to occur naturally, and appear to contain multiple rooms, doors and other aspects. Stone Brick, Mossy Stone Brick, Cracked Stone Brick, and Iron Bars were revealed in the same image as being the materials that make up the strongholds.

Deep Oceans

Deep Oceans Overview

This is a map view released by Notch. The dark blue areas are deep oceans

Deep oceans are an upcoming natural feature. Notch has apparently already finished their development.[2][3]

References

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