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📘 A cliff is a page, not a backdrop

Stand before one exposed layer in a cliff. Miller asks you to treat that stratum as a page from a book whose earlier chapters may be buried or erased — not scenery, but evidence waiting for a question.

3
lessons
~15 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. Reading a changing EarthUse visible landscapes as evidence of processes acting through deep time.Landforms are changing records, and geology explains their history by comparing rocks, layers, and missing evidence.
  2. Processes that reshape rockDistinguish breakdown from transport and connect landforms to water, ice, and wind.Weathering, erosion, streams, glaciers, and wind leave different but overlapping signatures in the landscape.
  3. Deformation, fire, and deep timeRead faults, igneous textures, strata, and fossils as evidence for sequence and change.The crust deforms and melts, while relative dating orders events without pretending every layer has an exact date.

Questions this course answers

What is the difference between weathering and erosion?

Weathering acts on material in place, while erosion removes and carries it.

What can a dike reveal?

A dike is an intrusion in a crack, so it also records an event younger than the rocks it cuts.

What does superposition usually tell a geologist?

Superposition establishes relative order; numerical ages require additional evidence and methods.

Why are some fossils useful for correlating rocks?

A broadly distributed, short-lived species can help identify rocks of similar relative age, with limits.

Grounded in trusted sources

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Every Wunder lesson is built from real, reputable sources — never invented.

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