Denny

December 9, 2017

Ice flower. For those that may not know, this is the result of water freezing inside of plant material, usually thick plant stems left over from the fall. Upon freezing it bursts through the stem creating very pretty, delicate curves that look like flower petals.

Denny

December 9, 2017

Enjoyed my first day browsing around micro.blog. Has a very functional, clean feel. No cruft. Will be interesting to see how the community evolves when it opens to the public. Currently it feels very exclusive which will change as the door is pushed open.

Denny

December 9, 2017

A few days ago I came across this post on Instagram.. Gut wrenching. Most weeks I only get in a car one time. It’s very intentional restraint with the goal of only burning the fossils fuels I must. But still. It’s too much.

Denny

December 8, 2017

15° this morning. I celebrated with the first bird feeding of this winter. Many feathered and furry friends are partaking.

What is Earth Made of

One aspect of astronomy that I have grown to love and appreciate is the tie in to the other areas of science. For example, planetary geology which, in turn, ties into our study of our own Earth’s geology. Of course this also ties into chemistry. And biology. And on on and.

This morning as I browsed Apple News1 I came across this very nice introduction to the geology of our planet. A quick read that might lead you to a much deeper exploration.

So, for example, this little bit about the Earth’s crust:

Earth’s crust is made up of several elements: oxygen, 46.6 percent by weight; silicon, 27.7 percent; aluminum, 8.1 percent; iron, 5 percent; calcium, 3.6 percent; sodium, 2.8 percent, potassium, 2.6 percent, and magnesium, 2.1 percent.

I always enjoy sharing with folks that particular tidbit about the crust being almost half oxygen. I think we generally think of oxygen as an important part of the air we breath and forget that it’s not just a gas. It’s fun to remind people that it also exists as a primary element in the oxide compounds of the ground we walk on!


  1. The app included on every iOS device and a great way to enjoy a variety of subjects with your morning coffee! ↩︎