For Kids · The land and the sky · The ground under you

The ground under Bergen

Vestland · Nordic & Baltic Boreal · limestone country

Fall · October 7, 2026

Bergen, Vestland

Nordic & Baltic Boreal·Hardiness zone 7b

Try it

Dig down under Bergen

Drag the spade down, or tap Dig deeper, through the leaves, the living topsoil and the subsoil, all the way to the bedrock that is really down there.

About 0 cm down

The grass

the top of the ground

Under the grass is a whole hidden world. Drag the spade down — or press Dig deeper — to find out what is down there.

Layer 0 of 5

It takes hundreds of years to make one centimetre of topsoil. The depths are typical — every place is different — and the ruler is squashed at the bottom so the rock fits on the screen.

Say it like this

Age 2“Dig, dig, dig! Who lives down there? A wiggly worm!”
Age 4“Leaves, dark soil, lighter soil, broken rock, solid rock. Can you count the layers? Five!”
Age 6“Topsoil is made of rotted leaves and tiny bits of broken rock. Why do you think it takes hundreds of years to make?”

Go outside: Dig a small hole in the garden and count how many worms live in one shovelful — then put them all back and fill it in.

The river right now

Water near Bergen is running very high

256%

of the ten-year median for this date · 3.3 m³/s against 1.3 normally

very high

drynormal for the dateflood

Well above normal. The river is moving gravel and wood, the banks are undercut and unreliable, and this is the state in which people drown. Watch it from the bank. It is dropping, roughly 52% over the week ahead.

Under your feet

Bergen sits on limestone

About 541 million years old — from the age of the first forests, amphibians and reptiles.

All the kinds of rock, and how each one forms →

At the surface541 million years oldSweetens the soil
Limestone
Sedimentary; Slope and deep water · Cambrian
What it is
Mostly calcium carbonate, most of it the shells and skeletons of animals that lived in warm shallow water where this place now sits. Break a fresh face and you can often see them.
How it wears
It dissolves rather than crumbles. Rain is faintly acid and limestone is the one common rock that reacts with it, so the ground develops fissures, sinkholes, caves and springs, and rivers can vanish underground and come out somewhere else.
What it means above ground
Thin, sweet, fast-draining soil over flat pavements of rock, with plants rooted straight into the cracks. Water that has run through it comes out hard and full of dissolved calcium, which is why limestone country grows so much fish food.
Below, layer 24.0 billion years oldSours the soil
Paragneiss
Precambrian crystalline metamorphic rocks · Precambrian
What it is
Gneiss derived from sedimentary rock rather than igneous — sand and mud laid down in a sea, then buried deep enough to recrystallise completely. Geologists tell it from the composition, which still carries the chemistry of the original sediment.
How it wears
Slowly and unevenly, since its bands differ in hardness; the softer ones etch out and the rock sheds in slabs.
What it means above ground
Thin, acid, stony soil, but more variable than plain granite country — a calcium-rich band left over from a limey bed can leave a sweeter pocket with a quite different flora in the middle of sour ground.
Below, layer 32.5 billion years oldSours the soil
Granite
Caledonian Orogenic Belt · Proterozoic
What it is
Magma that never reached the surface. It cooled kilometres down over tens of thousands of years, and that slowness is why its crystals are large enough to see without a lens: glassy grey quartz, blocky pink or white feldspar, and flecks of black mica.
How it wears
Feldspar turns to clay and lets go, so the rock crumbles grain by grain into coarse sharp sand. Rounded corners come first: a granite boulder field is a set of spheres because the edges weathered fastest.
What it means above ground
Sour, sandy, quick-draining soil that holds neither water nor nutrients well, over rounded outcrops and boulder fields. The water off it is soft, clear and acid, with almost nothing dissolved in it.

Bedrock and soil figures are modelled from national geological surveys and global soil mapping, at a resolution of a few hundred metres — right for the shape of a district, not for a particular garden. River discharge is modelled, not gauged. For anything that matters, dig a hole and look.

The field note for Bergen, every week

One email, Sunday evening. Unsubscribe anytime.

The ground under Bergen

Vestland · Nordic & Baltic Boreal · limestone country

Try it

Dig down under Bergen

Drag the spade down, or tap Dig deeper, through the leaves, the living topsoil and the subsoil, all the way to the bedrock that is really down there.

About 0 cm down

The grass

the top of the ground

Under the grass is a whole hidden world. Drag the spade down — or press Dig deeper — to find out what is down there.

Layer 0 of 5

It takes hundreds of years to make one centimetre of topsoil. The depths are typical — every place is different — and the ruler is squashed at the bottom so the rock fits on the screen.

Say it like this

Age 2“Dig, dig, dig! Who lives down there? A wiggly worm!”
Age 4“Leaves, dark soil, lighter soil, broken rock, solid rock. Can you count the layers? Five!”
Age 6“Topsoil is made of rotted leaves and tiny bits of broken rock. Why do you think it takes hundreds of years to make?”

Go outside: Dig a small hole in the garden and count how many worms live in one shovelful — then put them all back and fill it in.

Try it

Dig down under Bergen

Drag the spade down, or tap Dig deeper, through the leaves, the living topsoil and the subsoil, all the way to the bedrock that is really down there.

About 0 cm down

The grass

the top of the ground

Under the grass is a whole hidden world. Drag the spade down — or press Dig deeper — to find out what is down there.

Layer 0 of 5

It takes hundreds of years to make one centimetre of topsoil. The depths are typical — every place is different — and the ruler is squashed at the bottom so the rock fits on the screen.

Say it like this

Age 2“Dig, dig, dig! Who lives down there? A wiggly worm!”
Age 4“Leaves, dark soil, lighter soil, broken rock, solid rock. Can you count the layers? Five!”
Age 6“Topsoil is made of rotted leaves and tiny bits of broken rock. Why do you think it takes hundreds of years to make?”

Go outside: Dig a small hole in the garden and count how many worms live in one shovelful — then put them all back and fill it in.

The river right now

Water near Bergen is running very high

256%

of the ten-year median for this date · 3.3 m³/s against 1.3 normally

very high

drynormal for the dateflood

Under your feet

Bergen sits on limestone

About 541 million years old — from the age of the first forests, amphibians and reptiles.

All the kinds of rock, and how each one forms →

At the surface541 million years oldSweetens the soil
Limestone
Sedimentary; Slope and deep water · Cambrian
What it is
Mostly calcium carbonate, most of it the shells and skeletons of animals that lived in warm shallow water where this place now sits. Break a fresh face and you can often see them.
How it wears
It dissolves rather than crumbles. Rain is faintly acid and limestone is the one common rock that reacts with it, so the ground develops fissures, sinkholes, caves and springs, and rivers can vanish underground and come out somewhere else.
What it means above ground
Thin, sweet, fast-draining soil over flat pavements of rock, with plants rooted straight into the cracks. Water that has run through it comes out hard and full of dissolved calcium, which is why limestone country grows so much fish food.
Below, layer 24.0 billion years oldSours the soil
Paragneiss
Precambrian crystalline metamorphic rocks · Precambrian
What it is
Gneiss derived from sedimentary rock rather than igneous — sand and mud laid down in a sea, then buried deep enough to recrystallise completely. Geologists tell it from the composition, which still carries the chemistry of the original sediment.
How it wears
Slowly and unevenly, since its bands differ in hardness; the softer ones etch out and the rock sheds in slabs.
What it means above ground
Thin, acid, stony soil, but more variable than plain granite country — a calcium-rich band left over from a limey bed can leave a sweeter pocket with a quite different flora in the middle of sour ground.
Below, layer 32.5 billion years oldSours the soil
Granite
Caledonian Orogenic Belt · Proterozoic
What it is
Magma that never reached the surface. It cooled kilometres down over tens of thousands of years, and that slowness is why its crystals are large enough to see without a lens: glassy grey quartz, blocky pink or white feldspar, and flecks of black mica.
How it wears
Feldspar turns to clay and lets go, so the rock crumbles grain by grain into coarse sharp sand. Rounded corners come first: a granite boulder field is a set of spheres because the edges weathered fastest.
What it means above ground
Sour, sandy, quick-draining soil that holds neither water nor nutrients well, over rounded outcrops and boulder fields. The water off it is soft, clear and acid, with almost nothing dissolved in it.

The field note for Bergen, every week

One email, Sunday evening. Unsubscribe anytime.

The ground under Bergen

Dig down under Bergen

Water near Bergen is running very high

Bergen sits on limestone

Limestone

Paragneiss

Granite

The field note for Bergen, every week

The ground under Bergen

Dig down under Bergen

Dig down under Bergen

Water near Bergen is running very high

Bergen sits on limestone

Limestone

Paragneiss

Granite

The field note for Bergen, every week

Dig down under Bergen