what type of materials or deposits

[Tofu]

Hello Alan, Mister Micawber, Beeesneees, Mordant, Esl_Expert and other native English speakers,

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http://news.yahoo.com/s/space/20100621/sc_space/7thgradersdiscovermysteriouscaveonmars
Scientists aren't sure what type of materials or deposits could be stored inside.
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Shouldn't type be "types"?

[Alan]

Hi Tofu,

You tell me why, this time.

Alan
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English as a Second Language
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[Tofu]

Scientists aren't sure what type of materials or deposits could be stored inside.

My thought: materials and deposits are plural, so type should be "types"

[Alan]

Hi Tofu,

Thank you. I think you could justify both - a single type out of all the materials or many types out of all the materials. I agree that 'types' sounds better.

Alan
_________________
English as a Foreign Language
You can read my EFL story Progressive Forms

[Tofu]

Thank you, Alan. The same goes for "kind," doesn't it?

[Alan]

Yes, indeed.

Alan
_________________
English as a Second Language
You can read my ESL story Passive Voice