18 Things That Shouldn’t Be Able to Grow or Expand—But Do
In our everyday world, we usually relate development and expansion with living entities: plants reaching for sunlight, children outgrowing their clothes, or animals growing from small embryos to full-sized creatures. Surprisingly, nevertheless, many objects and substances that seem permanent or fixed can really grow in size or extent through amazing natural processes or unanticipated mechanisms.
Here is a list of 18 surprising things that seem like they shouldn’t be able to grow or expand—but actually do, defying our everyday expectations about how the physical world works.
Deserts
Deserts steadily march outward, claiming new territory year after year. The Sahara Desert expands southward at a rate of up to 30 miles annually in some regions, transforming once-fertile grasslands into sandy wastelands.
This process, called desertification, occurs as soil loses nutrients and moisture, creating an ever-widening circle of arid land.
Concrete
Concrete continues to strengthen and grow on a microscopic level long after being poured. The curing process can continue for decades as calcium silicate hydrate crystals form within the material, increasing its compressive strength by up to 25% after the first month.
Ancient Roman concrete structures are still undergoing these subtle crystalline changes after two thousand years.
Pearls
Pearls grow layer by layer inside oysters and certain other mollusks. When an irritant becomes trapped inside the shell, the mollusk secretes nacre—a smooth, lustrous substance—to coat the foreign object.
This protective mechanism adds about 0.5 millimeters per year to the pearl diameter, continuing throughout the mollusk’s lifetime.
Fingernails After Death
Medical examiners and morticians have seen an unpleasant phenomena whereby fingernails seem to grow after death. The retraction of skin as the body dehydrates exposes more of the previously hidden nail, which causes this seeming increase.
The result can cause nails to seem to be up to 0.1 inches longer following death.
Salt Formations
Expanding through evaporative processes, salt formations create enormous crystalline forms in locations such as Utah’s Bonneville Salt Flats and the Dead Sea. During drought, the salt structures of the Great Salt Lake can spread several feet outward yearly.
As mineral-filled water evaporates, these formations develop leaving behind ever intricate geometric crystal networks.
Black Holes
Black holes expand by consuming surrounding matter, radiation, and even light itself. The supermassive black hole at the center of the Milky Way galaxy, Sagittarius A*, grows by accumulating the equivalent mass of Earth every 1,000 years.
As matter crosses the event horizon, the black hole’s size increases proportionally to the incoming mass.
Oceans
Oceans grow in volume as global temperatures rise, through a process called thermal expansion. For every 1°F increase in temperature, sea level rises approximately one inch due to water molecules becoming more energetic and taking up more space.
This expansion occurs without adding any new water to the system, demonstrating water’s unique physical properties.
Icicles
Icicles grow downward through a precise balance of freezing and melting. Water runs down the exterior of the existing ice formation, freezing as it descends while being warmed by latent heat released during crystallization.
Under ideal conditions, icicles can lengthen by several inches daily, forming distinctive ribbed patterns as they extend downward.
Sinkholes
Sinkholes grow progressively larger through underground erosion long before becoming visible. Limestone and other soluble rocks slowly dissolve as acidic rainwater percolates through the ground, creating ever-expanding cavities.
The Winter Park Sinkhole in Florida expanded from a few feet to over 300 feet across within days as the underground chamber collapsed.
Stalagmites and Stalactites
Stalagmites and stalactites expand through mineral deposition at an extraordinarily slow rate. Each drip of mineral-saturated water deposits a microscopic layer of calcite, typically adding less than 0.005 inches annually.
The massive formations in Carlsbad Caverns have grown continuously for over 500,000 years through this patient, drop-by-drop process.
Plastics in Landfills
Plastics in landfills expand as they break down, contrary to expectations. Many plastic items fragment into increasingly smaller microplastics while simultaneously absorbing surrounding contaminants, effectively increasing their environmental footprint.
A single plastic bag can disintegrate into thousands of microplastic particles that occupy more ecological space than the original item.
Snow Crystals
Snow crystals grow more complex as they fall through humid air. Starting as simple hexagonal plates high in the atmosphere, they expand into intricate six-sided structures by attracting water vapor directly to their solid surface.
During their journey earthward, snowflakes can expand from microscopic specks to complex structures up to half an inch across.
Rust
Rust expands outward from iron and steel surfaces, occupying up to six times more volume than the original metal. This expansion creates the characteristic flaking and buckling seen on rusted items.
The chemical transformation from iron to iron oxide incorporates oxygen molecules, creating a compound that requires significantly more space than the original material.
Glass
Glass flows and expands over extremely long time periods, behaving as an incredibly slow-moving liquid rather than a solid. Ancient cathedral windows are often thicker at the bottom than the top due to this gradual flow downward over centuries.
While imperceptible to direct observation, this property explains why very old glass objects often show subtle deformation.
Moss
Moss grows on rocks, slowly breaking them apart through physical and chemical processes. As moss anchors onto stone surfaces, it produces mild acids that dissolve minerals while its expanding root structures create tiny fissures.
This relationship between seemingly immovable stone and delicate plant demonstrates nature’s persistence, with moss capable of colonizing entire rock faces over decades.
Soap Scum
Soap scum mysteriously multiplies in bathrooms despite regular cleaning efforts. The filmy substance grows as calcium and magnesium ions in hard water react with soap molecules, creating insoluble salts that accumulate on surfaces.
This chemical reaction explains why a barely noticeable residue can expand into a stubborn coating that requires significant effort to remove.
Ice Wedges
Ice wedges grow in permafrost regions through seasonal freeze-thaw cycles. Water enters tiny soil cracks, expands upon freezing, and widens the original opening.
With each yearly cycle, the ice formation becomes larger, eventually creating massive underground wedges that can extend dozens of feet downward and significantly alter the landscape above.
Foam Packaging
Foam packaging continues expanding years after production. Many polystyrene products slowly release trapped gases while absorbing moisture from surrounding air, causing subtle dimensional changes that become noticeable when old foam pieces no longer fit their original containers.
This phenomenon explains why decade-old electronics packaging often appears slightly larger than when manufactured.
The Unexpected Nature of Growth
Our world contains countless examples of seemingly static objects engaged in slow-motion transformation. These unexpected growth patterns remind us that the boundary between living and non-living isn’t always clear-cut when observed through the lens of change over time.
From microscopic crystal formations to massive geological features, the tendency toward expansion appears fundamental to our universe, suggesting that growth itself represents one of nature’s most persistent and universal processes.
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