Avery Denhoed, 10, left, and Hezekiah Sparks, 10, find a snail under a rock Wednesday during a field trip at Chiawana Park in Pasco. The two friends are in Becky Booth and Tammy Plewman's fifth-grade classes from Ruth Livingston Elementary in Pasco. "We're just looking for more opportunities for real science out in the real world," Plewman said. Students tested water and soil samples and created microecosystems. Avery shows the microecosystem he and Hezekiah created along the Columbia River. "They can be best friends," said Avery after the pair found another snail to join the first one.