Archive for October, 2010

November Science for Seniors Experiment

Sunday, October 31st, 2010

Why does the Earth experience seasons?

The Earth is tilted by 23 1/2 degrees. During the summer months,
the north is pointed toward the Sun allowing more direct sunlight.
During the winter, we are tilted away from the sun so the sunlight
is more indirect as the sun seems lower in the sky.
The summer solstice, autumnal equinox, winter solstice and vernal equinox, the are the first day of summer, fall, winter and spring. This coincides
with the position of earth as it goes around the sun.

Experiment: Materials –  a globe, flashlight and two adults who can walk.

In a dark room shine the flashlight representing the sun on the globe as the globe circles the sun to show how light and heat from the sun brighten and warm the Earth.

October experiment

Saturday, October 2nd, 2010

Fall, when the leaves turn from green to red and gold. This happens because the amount of sun the tree recieves diminishes and the tree stores nutrients for the winter months.

Materials – green plant/tree and aluminum foil.

Experiment – Take a well watered healthy green leaf plant and place it  in darkness for 48 hours.( I also used a tree in my backyard starting early morning after a rainfall – but an indoor plant may be the best way to demonstrate with residents. ) Wrap a leaf in foil and place in sunlight. The leaf will change color because of the diminished sunlight reaching the leaf.