by determining the age of lava rising at ocean ridges by determining the composition of limestone deposits by determining the rate of weathering of mountain ranges by determining the type of sedimentary rock formed on land
I gave my students this multiple choice question: How did scientists arrive at the theory of plate tectonics?

Only one answer is correct among these 4 choices:
- by determining the age of lava rising at ocean ridges
- by determining the composition of limestone deposits
- by determining the rate of weathering of mountain ranges
- by determining the type of sedimentary rock formed on land

Could you tell me which one is correct?

by determining the age of lava rising at ocean ridges