The Living Soil: Wonders of the World Below

Nature Nuggets

Home / Nature Nuggets

Have you ever held a handful of wet soil after the rain? That earthy smell has a special name: petrichor! It comes from tiny bacteria that live in the soil. It’s easy to forget that soil isn’t just dirt…it’s filled with life.

From the surface, you can see soil supporting trees, plants, and all the creatures that depend on them. But underground lies a whole secret world where roots intertwine, fungi spread, and creatures like earthworms and beetles thrive. In fact, a quarter teaspoon of soil can hold a billion bacteria and miles of fungal threads. Incredible, right?

Let’s dig in and discover the vibrant universe underground.

Did You Know Soil Has Layers Like a Cake?

Soils form in layers called ‘horizons.’ Very broadly, we can divide it into three layers.

The top layer, or topsoil, is full of roots, earthworms, and insects. This is where most of the action happens. Beneath it is the subsoil, which has fewer living organisms but stores minerals and water. And, deep below lies the bedrock: solid stone that slowly breaks down over thousands of years to make new soil.

And here’s something amazing: soil takes hundreds or even thousands of years to form just a few centimetres. That means the ground beneath your feet is probably older than every building around you! That’s why soil is considered a non-renewable natural resource.

Watch this video to see why soil is such an incredible resource for the planet.

Can Life Exist on Land Without Soil?

The answer is no…and here’s why. Trees stay tall because their roots grip the soil. Grasses survive scorching summers because soil stores water like a sponge. When animals dig burrows, they create pathways for air and rain to reach deeper layers. And when leaves fall, they decompose and return nutrients to the soil, feeding the next generation of plants. It’s nature’s perfect recycling system!

Even in cities, soil surprises us. Peek under a garden or into pavement cracks and you’ll find ants hauling food to underground chambers, snails leaving silvery trails, and centipedes hunting for prey. Tree roots are so strong they can crack through cement. Mushrooms pop up overnight in damp corners after rain.

In fact, all of this might be happening right in your own backyard. Explore this interactive resource to discover what’s living beneath your feet.

Meet the Creatures Living Underground

So who exactly lives in the soil? Let’s meet some incredible creatures that dwell below the surface of the earth.

Earthworms can eat up to a third of their body weight in a day! As they move, they mix and aerate the soil, helping plants grow stronger roots. Their tunnels allow rainwater to seep in, preventing flooding and erosion.

An ant colony’s tunnels can stretch for metres, like a hidden city beneath our feet! Some colonies even have several rooms or chambers for different purposes like food storage!

Ground dwelling spiders and centipedes are nature’s checks for keeping insect populations in balance.

Additionally, many species, like the Indian bullfrog, burrow into the soil during dry climate through a process called aestivation. It’s a dormant state that helps them stay cool and safe while they wait for the rains to return. Their presence is a sign of healthy, moist soil.

Snakes like the sand boa are burrowers and also wait just below the surface of the soil for prey to come along their way. Their smooth scales help them glide through the soil without resistance.

Small mammals like the Indian field mouse dig burrows for nesting and food storage, helping loosen and turn the soil as they dig. Also, fungi form vast networks called mycorrhizae that connect plant roots, allowing them to share water and nutrients.

And that’s not all! Monitor lizards lay their eggs in soft soil so the sun can keep them warm. Jackals and foxes dig dens for their young, and turtles bury their eggs in beaches and sandy banks near rivers. The soil provides for so many creatures!

What’s the Link Between Soil and Your Dinner?

Almost everything on your plate started in the soil. Grains, fruits, and vegetables grow strong because soil gives them essential nutrients and clean water. Even the chicken, mutton, or milk you consume depends on soil, since livestock eat plants that grow from it.

The simple truth? When soil is healthy, food is healthy.

Soil Health Is Deteriorating and Ecosystems Are at Risk…but You Can Help

When forests are cut down or farmland is overused without rest, soil becomes weak and washes away. Chemicals from factories and pesticides pollute it, making it unsafe. As cities expand, concrete covers more ground, blocking air, water, and nutrients from reaching the soil. Trees struggle. Crops fail. Food becomes scarce. Remember: soil takes hundreds of years to form, yet we can destroy it in just a few.

The good news? You can make a difference. Learn more about how to protect soil and keep it healthy through this resource.

December 5th is World Soil Day. It’s the perfect time to become a soil champion!

How Well Do You Really Know Soil?

Let’s see how well you really know the ground beneath your feet! Take the quiz below.

1. What causes the earthy smell after the rains?
- a. Tiny organisms living in the soil
- b. Fallen leaves
- c. Water mixing with dust
2. Which layer of the soil is home to most roots, earthworms and insects?
- a. Subsoil
- b. Bedrock
- c. Top soil
3. How long can it take for just a few centimeters of soil to grow naturally?
- a. A few months
- b. A few years
- c. Hundreds of years
4. What happens when we cover the soil with too much concrete?
- a. The soil gets less air and water and plants struggle to grow.
- b. The soil becomes healthier and full of nutrients.
- c. Rainwater quickly soaks into the soil and keeps it moist.