mnemonic ummmmm, how about i just give you the Time Periods in order

In order from oldest to youngest on the Geologic Time Scale, First is the Cambrian, the Ordovician, the Silurian, the Devonian, the Mississippian and Pennsylvanian (Carboniterous), the Permian, the Triassic, the Jurassic, the Cretaceous, the Tertiary, the Quaternary and that is the youngest/most recent of the periods.

COSDMPPTJCTQ

Why do you want to know about a tree? hmmmm?

Scientists can determine the age of a tree by examining its ring's, because a tree grows a new ring every year. It would be useful because not only does a tree grow a ring every year but the rings width will differ. The reason for this, is that a trees ring will be thick if there was alot of water that year and thin if it was very little. Scientists can use this to distinguish a weather pattern in a certain region, also to see how much the weather is changing from how it is today and how it was before. It is an example of absolute dating.

which layer is the oldest, which is the youngest?

Layer D, is the oldest layer because layer's A and e are on top of it. Layer E's the second oldest and layer A is the third oldest because the same rock composition of layer B is above it, Then next is layer B and the youngest of all the layer's is C.

The unconformities are the squigly lines between layer's A and B, also at the very top of B due to erosion (weathering)

Volcanoes or Earthquakes...humm...Volcanoes or Earthquakes?

I think Volcanoes are more dangerous than Earthquakes, because Volcanoes can cause Earthquakes and Volcanoes have long lasting effects on the enviroment. A Volcano can destroy a whole forest, kill wildlife and block out the sun for some time also it can harm water bodies or lakes, killing any fish or life in it.

Want i think my grade should be?

What i think i should get for my first quarter blog post? Well i think i deserve a grade within the range of an 85B-94A, mainly because i answered all the questions for each blog with an exceptional amount of accuracy and facts. Also because my blogs are very descriptive and written in a professional manner such as using the correct type of grammar on an educational site used for the purpose of me getting grades and not for a look alike myspace page,with graffiti styled words and article headlines that sound and are made to look good and are off topic. I also think my grade should be based a little on the fact that 95% of my blogs have been posted on time. I also make sure my blogs give reasonable answers before i post them on to my page. That's not all but I'm going to stop for now and i hope i gave you enough excuses lolz! jp;=), reason's on what i think my grade should be.

Rocks! Sedimentary, Igneous, and Metamorphic all rocks!

The two main types of Igneous rocks are Intrusive which is the solidifying of magma under the earth's crust, and Extrusive which is the hardening of lava above the earths surface. An example of an Intrusive Igneous rock is Basalt which is a fine grained, dark colored rock composed mainly of material called plagioclase and pyroxene. An example of an Extrusive Igneous rock is Rhyolite, which is a light colored fine grained rock that usually contains quartz and feldspar minerals.

The two types of Metamorphic rock are Foliated and Non-Foliated rocks. Foliated rocks appear to have a layered or banded appearance that is produced by heat and directed pressure. Non-Foliated rocks do not have a layered or banded appearance. An example of an Non-Foliated rock is Amphibolite which forms through recrystallization under conditions of high viscosity and directed pressure. It is composed primarily of amphibole and plagioclase usually with very little quartz. An example of a Foliated rock would be Gneiss which has a banded appearance and is made up of granular mineral grains. It usually contains an abundant amount of quartz or feldspar minerals.

The two types of Sedimentary rocks are Clastic and Chemical. Clastic rocks consist of Breccia, Conglomerate, Sandstone, and Shale which is formed from mechanical weathering debris. While Chemical rocks such as rock salt and some limestones that form when dissolved materials precipitate from a solution. An example of a Clastic rock would be Shale which is made up of very small millimeter sized clay/weathering debris. It usually breaks into flat thin pieces. Rock salt is an example of a Chemical Sedimentary rock which form's from the evaporation or a ocean or saline lake waters. Also known as Halite, it is often used for chemical indusrty, highway treatment and as food seasoning.