In Earth's History


Sedimentary Rock: Sedimentary rocks are types of rock that are formed by the deposition of material at the Earth's surface and within bodies of water. Sedimentation is the collective name for processes that cause mineral and/or organic particles (detritus) to settle and accumulate or minerals to precipitate from a solution.

Metamorphic Rock: Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". The original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (1500 bars), causing profound physical and/or chemical change.

Igneous Rock: Igneous rocks are formed from the solidification of molten rock material. There are two basic types: 1) intrusive igneous rocks such as diorite, gabbro, granite and pegmatite that solidify below Earth's surface; and 2) extrusive igneous rocks such as andesite, basalt, obsidian, pumice, rhyolite and scoria that solidify on or above Earth's surface.

  1. Stratification is the relative social position of persons in a given social group, category, geographical region or other social unit. In modern Western societies, stratification is often broadly divided into three main divisions of social class: upper class, middle class, and lower class.

2. Fossils have been known to people for hundreds of years, but it was not until the late 1700’s and early 1800’s that people began to really think hard about what fossils are and what they mean. At this time, a few individuals were beginning to guess that the earth was much older than had previously been believed. These thinkers used ideas from human history to begin studying earth history.

I think that the younger one's are on top because when the new ones come the older ones ger pushed down.


                        #BrainCellsInUse                                  By: Cierra Eagleburger

Cells- the smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane. Microscopic organisms typically consist of a single cell, which is either eukaryotic or prokaryotic.

What the differences are between a plant and animal cells-Although, the overall function of the cell is the same, there are some important differences between animal and plant cells. The firstdifference is that plant cells have an organelle called chloroplast. Chloroplasts contain a pigment called chlorophyll (which gives the plantits green color).

-Plant Vs animal cells-Plant and animal cells have several differences and similarities. For example, animal cells do not have a cell wall or chloroplasts but plant cells do. Animal cells are round and irregular in shape while plant cells have fixed, rectangular shapes.

Plant and animal cells are both eukaryotic cells, so they have several features in common, such as the presence of a cell membrane, and cell organelles, like the nucleus, mitochondria and endoplasmic reticulum.

-Muscle Cells-a tissue composed of cells or fibers, thecontraction of which produces movement in thebody. An organ, composed of muscle tissue, thatcontracts to produce a particular movement.

-A Nerve Cell is a neuron.

-A cell that is part of a bone. Types: megakaryocyte. a large bonemarrow cell; regarded as the source of blood platelets. osteoclast. cellthat functions in the breakdown and resorption of bone tissue.

-A cartilage cell located in a lacuna of the cartilage matrix.

-Secretory Cell Medical Definition of SECRETORY. : of, relating to, or promotingsecretion; also : produced by secretion.

- A Epithelium is composed of one or more layers of densely packed cells. In vertebrates, it lines the outer layer of the skin (epidermis), the surface of most body cavities, and the lumen of fluid-filled organs, such as the gut or intestine.

A tissue is made up of a group of cells that usually look similar to one another and come from the same region in a developing embryo. The group of cells that make up a tissue have physiological functions that work together in a coordinated way to support special functions. The special function of a tissue is also influenced by the kind of material that surrounds the tissue and by communication among the cells of the tissue. Different kinds of tissue have different physical properties. Tissues may be hard (bone), soft (muscle), or even liquid (blood).We all have livers, but how often do we really think about them? Unlike your heart, your liver doesn't pound when you feel nervous. Unlike your stomach, your liver doesn't make growling noises when you get hungry. As long as your liver stays healthy, it's easy not to notice. Although your liver works "behind the scenes", it's also one of the largest and most important organs in your body. It performs more than 300 functions, and helps some of your other organs do their jobs.

Your digestive and respiratory systems, at first glance, seem very separate in their activities. In reality, however, the systems work together intimately in several ways. The results of respiratory activity allow the digestive tract to function, and vice versa. Furthermore, the systems work together to provide energy to body cells.The purpose of your digestive system is to take in food from your environment and break it down on both macroscopic and molecular levels. Through the process of digestion, you break large nutrient molecules into smaller ones that your intestine absorbs into the bloodstream. Cells then take up these nutrient molecules and use them to build new molecules and provide for their cellular energy needs. Cells can also store the molecules for later use.

All cells have a purpose. If they don't do anything productive, they are not needed anymore. In the big picture, a cell's purposeis much more important than acting as small organizational pieces. They had their purpose long before they started working together in groups and building more advancedorganisms. When alone, a cell's main purpose is to survive.