Wang Zhan decided to learn about the cave, because this cave not only had snakes, but also many intricate roads, and Wang Zhan felt a little pressure. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

Although he has a protective shield, his teammates do not. And in case of danger, it may be difficult for you to protect yourself.

So it's still something to think about and look at the nearby topography. If you think deeply, you should also consider the soil quality. If the cave is in danger of collapsing, be sure to prepare in advance to avoid accidents.

Some caves are very complex and there are many unexpected situations inside. If you want to go caving, be sure to be well prepared.

Naturally formed or artificially mined and opened pores. It is a naturally formed or artificially mined and opened hole on the mountain. The naturally occurring pores are relatively small and irregular, used only for shelter from rain or archaeology, and are mostly open.

It may be easy for Wang Zhan to get in, but it will be difficult to get out. Accidents can happen at any time.

Before entering the cave, you must first understand all kinds of information about the cave as much as possible, such as the length of the cave, the number of forks in it, whether there are other exits, whether the cave wall has collapsed, what kind of animals are in the cave, whether there are harmful gases in the cave, and be prepared.

It is best to walk in a group and not separate in the cave. Bring enough food and drinking water, and don't drink the water in the cave if you don't know the situation.

Lighting equipment is indispensable, it is best to use searchlights, electricity should be sufficient, and if possible, bring a spare.

Bring more candles, light wax after entering the cave, and burn the candle on the cave wall as you go, it will leave a blackened mark on the cave wall, in case you get lost, you can also follow this mark to come out. In addition, if there is no wind and it is not man-made, if the candle cannot be lit, it means that there is a lack of oxygen in the cave, so it must be remembered that you should go back quickly.

It is best not to stay overnight inside the cave. Wang Zhan and the others must have spent the night outside, and they have already set up camp according to the book.

If you are curious about a small hole, don't reach in, use a stick to explore it first. Hehe, in case you are unfortunate enough to encounter snakes, bats, etc., it can also be used as a weapon for self-defense.

Wang Zhan also has a telescopic gold pen, as well as an arc moon scimitar. There should be no problem with self-defense. The teammates are also experienced in many battles, and unless it is a swarm or a snake swarm, there will definitely be no major problems.

If he encounters a group of snakes, Wang Zhan's choice is to escape. If you can, you won't fight.

It's already difficult to survive in the wild, let alone fight.

Class I soil (soft soil)

Slightly clay sand, silt, humus and loose planting soil, peat (silt).

Dig with a shovel, a little with a pedal or with a hoe with a board.

Class II Soil (Ordinary Soil)

Moist clay and loess, soft saline and alkaline soils, accumulation soils containing building material chips, crushed stone, pebbles and planting soils.

Dig with shovels, hoes, pedals, and a little pickaxes.

Three types of soil (hard soil)

Medium-dense cohesive or loess, moist clay or loess containing crushed stone, pebbles, or debris of building materials.

Mainly use pickaxes, hoes, and a few shovels.

Four types of soil (gravel soil)

Hard and dense clay soil or loess, medium dense clay or loess containing crushed stone, gravel (stone with volume of 10~30% and weight of less than 25kg), hardened heavy saline soil, soft marl

All excavated with pickaxes, hoes, and a few with crowbars.

Five types of soil (soft stone)

Hard Carboniferous clays, poorly cemented conglomerates, soft, jointed limestone and shell limestone, solid chalk, moderately solid shale, marl.

Dig with a pickaxe or crowbar, sledgehammer, and partly use the blasting method.

Six types of soil (sub-hard stone)

Hard argillaceous shale, solid marl, breccia granite, marl limestone, clayey sandstone, mica shale and sandy shale, weathered granite, gneiss and syenite, talc serpentine, dense limestone, siliceous cemented conglomerate, sandstone, sandstone limestone shale.

Excavations were carried out by blasting methods, and partly with air picks.

Seven types of soil (solid stone)

Dolomites, marbles, solid limestone, calcareous and quartzite sandstone, hard sandy shale, serpentine, coarse-grained syenite, weathered andesite and basalt, gneiss, coarse face, medium-coarse granite, solid gneiss, diabase, porphyry, medium-coarse syenite.

Excavation by blasting method.

Eight types of soil (extra hard stone)

Solid fine-grained granite. Granitic gneiss, diorite, solid porphyry, amphibole, gabbro, quartzite, andesite, basalt, the most solid diabase, limestone and diorite, olivine basalt, particularly solid gabbro, quartzite and porphyry.

Excavation by blasting method.

More than five types of soil should be excavated by blasting, Wang Zhan thought about it, this is probably six types of soil, and it is still quite hard.

Then it's time to look at the soil. The soil is composed of minerals, animals and plants weathered from rocks, organic matter produced by the decomposition of microbial residues, soil organisms (solid phase substances), water (liquid phase substances), air (gas phase substances), and oxidized humus. Solid matter includes soil minerals, organic matter and nutrients obtained by microorganisms through light sterilization. Liquid matter mainly refers to soil moisture. Gases are the air present in the pores of the soil. These three types of substances in the soil constitute a contradictory unity. They are interconnected, mutually restrictive, provide the necessary living conditions for crops, and are the material basis of soil fertility.

The composition of soil is solid, gaseous and liquid.

Soil minerals are mineral particles of different sizes (sand, soil and gum) formed by the weathering of rocks. There are many types of soil minerals and complex chemical composition, which directly affects the physical and chemical properties of the soil and is one of the important sources of crop nutrients.

Solid soil particles composed of minerals and humus are the main body of the soil, accounting for about 50% of the soil volume, and the pores between the solid particles are occupied by gas and water.

The vast majority of soil gas is oxygen and nitrogen entering the atmosphere, and a small part is carbon dioxide and water vapor produced by life activities in the soil. The moisture in the soil enters the soil mainly from the surface and includes many dissolved substances.

There are also various animals, plants, and microorganisms in the soil.

On the whole, Wang Zhan felt that it was okay, it was not particularly difficult, the only thing that was terrible was probably that there were animals inside.

(Main development----- the protagonist Wang Zhan travels to another world and begins to slowly understand the cruelty of this world. Wars arise because of interests, and they expand into dark phenomena such as aggression, killing, revenge, and hostility. And Wang Zhan, who has received a higher education in the new century, came to this world, joined the Huaxia Kingdom, and gradually resolved these sorrows through hard work. In the end, the enemy government was eliminated, the people realized the beauty of stability, and peace finally came. {Tendency - Victorious Country: Huaxia State; Result: Peace})