Aclassic piagetian test of formal reasoning is the

The classic piagetian test for formal reasoning is called the pendulum problem. In this test, psychologists will see how the children experiment.  It will use a pendulum, or a pendulum-like type and the amount of swing will depend on the height and the weight of the pendulum and how high it is. 

fir trees are found in areas with cooler climates. fir trees have needles for leaves and remain green year-round.

swahili is an extremely rich and complex civilization, a set of ethnic groups articulated by a language and a series of cultural elements that fuse the african traditions, islam and indian culture. this growth was largely a result of the indian ocean trading network that brought in not just man-made riches, but also religious ideas, specifically islam, which had a significant impact on the local culture. furthermore, the development of the swahili language gave a common cultural unity to the people.