Trees can weigh hundreds or even thousands of tons, but where do they get this mass from? A few common answers are: the soil, water, and sunlight. But the truth is the vast majority of a dry tree’s mass comes from the air – it originated as carbon dioxide
Our early ancestors relied on lightning to cause forest fires, from which they could collect coals and burning sticks to help them cook food and clear land. Continue reading
Contributed by Les Asselstine.
Help your students become more aware and knowledgeable about the natural environment in their community. This can be done by examining natural communities near fences, under logs, and in cracks of the pavement. Continue reading