methods 2 week 10

 

  1. The big question addressed in lab, and a description of what you did.
What makes a rock. 
During lab we did a pre assessment over what makes a rock a rock. 
We learned that anything that comes from the earth in rock form is a rock. 
We then did a lab with starbursts. We used heat and compactness to form rocks. 
  1. A description of what you learned in Thursday's lecture.
We went over our pre assessment, it is when it is made naturally by earths minerals. 
The earths core is solid and we know this from earthquakes because the waves are broken up when it hits the core. 
There is an "innermost inner core" scientists believe are in the core of earth. 
Convection cells happen in the mantle and affect the crust. 
There are two kinds of plates: oceanic and continental. 
Pangea: 
Created mountains and plains, the material from the mountain range into the midwest and made it so Iowa is not underwater anymore. 
CARBONATION: process by which dissolved carbon dioxide in rainwater or 
moisture in surrounding air forms carbonic acid and reacts with the minerals in 
the rock. This process weakens the rock thus breaking it down in the process. 
e.g.: Calcium Carbonate + Water + Carbon Dioxide ---> Calcium Carbonate 
(soluble) 
HYDROLYSIS: chemical reaction between the minerals in the rock and 
hydrogen in rain water. For example, during hydrolysis, the feldspar in granite 
changes to clay mineral which crumbles easily, weakening the rock and causing 
it to break down. 
OXIDATION: The process by which oxygen combine with water and minerals 
in the rock such as calcium and magnesium. When iron reacts with oxygen, 
reddish -brown iron oxide is formed. The iron-oxide crust crumbles easily and 
weakens the rock. e.g. : Iron + Oxygen --> Iron Oxide (crumbles) 
SOLUTION: process by which minerals in the rocks dissolve directly in water. 
HYDRATION: process where minerals in the rock absorb water and expand, 
creating stress which causes the disintegration of rocks. 
  1. Answer questions about the weekly textbook reading:
    1. What did you learn?
The life cycle of a rock which are split between the different types of rocks, Sedimentary, Igneous, and metamorphic. 
    1. What was most helpful?
While reading and learning about a rocks lifecycle, this image was most helpful:

    1. What do you need more information on?
The Archimedes principle, I am confused because there are objects that weight more than water filling the same amount of volume. (I think)
    1. What questions/concerns/comments do you have?
If sedimentary rocks form when particles come together, when it breaks apart, is that when sand is created?

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