Thursday Morning Riddle

I’m the crust of a pie before more goes inside;
I’m a pasta for sauce; where electrons can ride;
I’m a cartridge for shotguns; where peanuts reside;
And the quickest safe place for a tortoise to hide.

Who am I?

UPDATE: Riddle solved by Alex. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Alex Says:

    Shell.

  2. Bill Says:

    SHELL is correct. Way to go, Alex!

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