480 million years ago The ground shakes. The lava comes, flowing out over the land. It hardens forming a thick wrinkled skin of new rock.
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480 million years ago The ground shakes. The lava comes,
flowing out over the land.
It hardens forming a thick wrinkled
skin of new rock.
395 million years ago Giant plates are colliding, pushing against
each other to form mountains.
Rain falls on the mountains and runs down
the rock.
Little leafless plants grow in damp places
390 million years ago Pieces of rock rumble and bounce down
the mountain.
The wind blows and smoothens the rock.
Everything is being slowly eroded away.
The tops of mountains disintegrate into
pebbles.
375 million years ago The river tumbles and rolls the rock.
It eases the rock through swamps where
fish haul themselves out of the water
and breathe air.
The rock travels for thousands of years.
340 million years ago The river drops the pebble onto the
beach. The waves wash it forwards and
backwards.
The sea starts to flood the land. Gradu-
ally the sand between the pebbles hard-
ens forming a new layer of land.
The sea covers the mouth of the river
300 million years ago Sedimentary rock is formed by dead
sea creatures under the sea.
The surface of the Earth begins to
rise to make new land above the
water.
The pebble is buried deep under the
155 million years ago In 10 million years the layers of the
Earth have risen 5000 metres.
The wind wears away layers of rock. A
slab tumbles down the cliff.
67 million years ago
At night small mammals scuttle across
the rock as dinosaurs sleep.
Gradually the mixture holding the
pebbles together crumbles.
65 million years ago
A meat-eating dinosaur attacks a
plant-eating dinosaur. In the fight,
the pebble skids into the river.
It settles onto a sand bar in the river.
15 million years ago The river flows on a new course and
the pebble lies at the bottom of the
old river bed.
The dinosaurs have died out.
1 million years ago The wind blows colder. Snow falls.
The snow packs down and old snow turns
into glacier ice.
The glacier slowly moves down the hill.
1 million years ago Gradually the weather warms and the
glacier melts.
Boulders, rocks, pebbles, sand and gravel
are dropped to the ground.
Different types of rocks all lie on top of
200,000 years ago Floods leave the pebble high on a river
bank.
People come to fish, hunt and build
shelters. A boy picks up the pebble to
125,000 years ago The cold comes back and people move
away.
Ice sheets cover the land.
When warmth returns the melting ice
drops the pebble into a lake.
12,000 years ago A new glacier gouges the pebble out
of the bottom of the lake and pushes
it along for thousands of years.
The ice retreats leaving the pebble on
the slope of a valley.
0 years ago The pebble hasn’t moved much since the
last ice age.
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