On looking a little closer at some planets we found that a
few have volcanoes on them and it was something that really interested the children.
I always find volcanoes a really alien part of our planet
anyway. They are volatile, explosive and because of the different levels of structure
they can be quite alien compared to the rest of the life and structure of
planet earth.
Despite this there is a certain element of “they belong on
earth” when actually any planet that has or had a molten core would of course
have volcanoes too.
Volcanism has played a major part in shaping not only planet
Earth, but other places in our universe. Though other planets show signs of
volcanic eruptions, most seemed to have erupted in the distant past and are
inactive now. Both Mars and Venus have volcanoes much larger than any on Earth,
and they have erupted huge amounts of lava onto their surfaces in the past.
The planet Venus has a surface that is 90% basalt,
indicating that volcanism played a major role in shaping its surface. The
planet may have had a major global resurfacing event about 500 million years
ago, from what scientists can tell from the density of impact craters on the
surface. Lava flows are widespread and forms of volcanism not present on Earth
occur as well. Changes in the planet's atmosphere and observations of lightning
have been attributed to ongoing volcanic eruptions, although there is no
confirmation of whether or not Venus is still volcanically active.
This is the cool part for children I think. The idea that
lava, a hot unstable feature that is known to happen here can happen on other
planets is rather cool.
We did create our own papier mache volcanoes (like any part
with primary aged children should do) but the lava part was still intriguing.
It was because of this that I remembered a science activity on how to make your
own lava lamps and thought we could combine the two parts; volcanoes and lava
and a cool activity!