Pictures: York Science Activity

Yorktown High School ninth-graders use marbles to complete an activity to identify different sources of organic matter during Earth Science class on Thursday, January 10.

( Kaitlin McKeown/Daily Press / January 11, 2013 )

Yorktown High School ninth-graders use marbles to complete an activity to identify different sources of organic matter during Earth Science class on Thursday, January 10.

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