dúnadan: It is Monday morning and I am in the middle of a field with a big hole in it somewhere in central Dorset. That's right, it's Monday, because when I came on Friday to interview the inquisitive cow, she was the invisible cow!
inq. cow: Well, I wasn't invisible, I just wasn't here. I am very sorry, dúnadan, I forgot to tell you that I would be staying overnight with, well, friends.
dúnadan: That's alright. Father Bill was very accomodating. He said I could stay in the barn. After the third bottle of cider it was really quite comfortable.
inq. cow: He is a true gentleman...
dúnadan: Hm. So, about this hole. It is not any hole, of course, but the result of your archeological dig.
inq. cow: That's right. We thought we might have discovered a villa but it looks like it could be a military barracks. The mosaic that we discovered is not a picture but an outline of a battle plan against the Durotriges tribes. You can guess whose interest in archeology increased after we uncovered the whole mosaic.
dúnadan: Where is Tecumseh now?
inq. cow: He has disappeared. I strongly suspect he has gone to try and raise a legion.
dúnadan: So, about the Durotriges.
inq. cow: Yes, they were a confederation of tribes based in Dorset. Unlike many of the British tribes in the Roman age, they lived on hillforts - just like their ancestors had done a thousand years earlier.
dúnadan: Why did they not move on?
inq. cow: Well, the hillfort was a safe place. Security before prosperity. The Durotriges were stern fighters and may have been mentioned by Seutonius in his account of Vespasian's British campaign. I cannot confirm this, however, as my copy of Seutonius'
Life of Vespasian strangly disappeared on the same night as Tecumseh Squirrel.
dúnadan: Life would be so much simpler round here if squirrels hibernated! Let's move on, I understand you have been teaching Farmer Phil about volcanoes. Why would a farmer be interested in volcanoes?
inq. cow: Farmer Phil isn't, but his son, Phil jr, is... let's take a walk over to his farm.
dúnadan:... so here we are, in Farmer Phil's field, where we are standing underneath a marquee in the present of a giant model clay volcano! It must be a good ten feet in hight. The lower part of the volcano has been sprinkled with cut grass while twigs for trees have been inserted.
inq. cow: Farmer Phil's intention is to rig the volcano so that Phil Jr can explode it on Christms Day. He doesn't intend to simply build this shell, however, and have fire come out of it - he wants to make the volcano as realistic as possible.
dúnadan: Hence, he asked you to advise him on how volcanoes erupt. How does it happen?
inq. cow: Well, let's remove the curtain from the table on which the volcano stands. You will note that the volcano rests on a rigid plate. This is the lithosphere. We cannot see it, but underneath the middle of the volcano, the lithosphere is divided in two. For the readers, the reason we cannot see this divide is because underneath the lithosphere is the rock mantle.
dúnadan: There is a fluid between the lithosphere and mantle.
inq. cow: Indeed. That is the athenosphere. The athenosphere allows the lithosphere to move. It is this movement that is ultimately responsible for volcanic eruptions. Moo! What happens is that the two plates of the lithosphere collide. In doing so, they drive each other downwards into the mantle rock. This process, called subduction, causes the driving crust to heat up and the mantle rock to melt into magma. Because magma is less dense than mantle rock, it rises quickly - just like a helium balloon does in the air - so that magma chambers are formed. And then, boom!
dúnadan: Argh!
>the dúnadan falls onto his backside<inq. cow: If the pressure on the magma is high enough, the volcano will erupt!
dúnadan: Gerrie, you scared the life out of me!
inq. cow: Wait till you see this vocano go off on Christmas night! Of course, I have greatly simplified the process of what happens when the lithosphere plates react to each other, but it seems you understand the essentials in this case.
dúnadan: I think I do! Blimey, can we talk about something more peaceful? Why do leaves change colour in the autumn?
inq. cow: That's easy. Leaves gain their colour from their chlorophyll cells. In the autumn, the tree stops producing chlorophyll causing the leaf to change colour. You see the yellow leafed trees over by Farmer Phil's house? They are yellow because they have the chemical xanthophyl in them. Xanthophyl defines their pigmentation.
dúnadan: Let me test you... in what year did the Battle of the Fei River take place, who was involved and what was the outcome?
inq. cow: Now, dúnadan, you think you are trying hard but you aren't! Do you remember when we talked about Shijing poetry? Well, as well as instructing me in Chinese, he taught me a little history. Therefore, I can tell you that that the Battle of the Fei River took place in the fourth century
anno domini and was between Fu Jiān and the army of the Eastern Jin whose kingdoms lay south of the Yangtze River.
dúnadan: I'm sure I once played a game called Yangtze... anyway, once again, your knowledge proves to be most impressive. So, before we finish up, what is on the agenda for you this week?
inq. cow: It will be a busy week. This afternoon, Horace the Impressionist Horse opens his first exhibition in Cuddly Bottom. Tomorrow, there is the official opening of Augustine Squirrel's recreation of the ancient city of Petra while on Thursday there will be a demonstration in our own village against the parish council's plans to build a gravel track between the library and village hall. You can tell that life moves slowly in these parts!
dúnadan: Indeed! Well, I hope victory follows. Gerrie, thank you for your company and I shall see you in five days time!
inq. cow: Incase any readers have joined us late, let me reiterate that I was just with friends!