Oklahoma Science ES.ESS1.5

ScienceGrades 9–12Earth’s Place in the Universe

The Standard

Evaluate patterns in evidence of the past and current movements of continental and oceanic crust and the theory of plate tectonics to explain the ages of crustal rocks.

Oklahoma Academic Standards for Science (2026)

Teacher's field guide

What This Standard Means

What Students Need to Do: Students compare rock ages with distance from ocean ridges and trenches. They use those patterns to explain how plates create new ocean crust and recycle old ocean crust.
What Mastery Looks Like: A student can point to younger rocks near a ridge and older rocks farther away on a seafloor age map. They can explain why some continental rocks are much older than ocean crust.
Common Misconceptions: Students may think ocean crust is oldest at a ridge because the ridge looks like a mountain. They may also think all crust is the same age or that old ocean crust remains at the surface forever.
How to Assess It: Show a ridge with seafloor samples taken 0, 200, and 400 kilometers away, aged 0, 10, and 20 million years. Ask students to explain the pattern and predict what happens to ocean crust at a subduction zone.

Lesson moves

Ways to Teach It

Lay paper strips labeled 0, 10, and 20 million years on both sides of a taped ridge to model seafloor spreading.
Show a seafloor age map and ask, 'What age pattern supports the claim that new crust forms at ridges?'
Give pairs seafloor location and rock-age cards, then have them race to match younger ages with sites closer to a ridge.
Open a seafloor age map and compare the Mid-Atlantic Ridge with ocean floor near the American and African coasts.

Free download