Which of these numbered features is over continental crust that has been the most thinned by rifting? 
Definitions:
Conservation
A principle in cognitive development theory stating that physical quantities remain constant in spite of changes in their shape or appearance.
Scaffolding
An educational technique where a teacher adjusts the level of support provided to the student in the learning process, based on the student's performance.
Vocabulary
The set of words known and used by a person in a particular language.
"What's That?" Questions
Questions often asked by young children as they explore their environment and learn about the world around them through inquiry.
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