Making fossils

To make fossils my partner and I used three different molds (10oz). Each mold had the same amount of water (4oz). The remaining 8 oz were plaster and sand. Mix one contained 75% sand and 25% plaster. This mixture was very easy to break apart and the impression from the shell wasn't very visible. The 2nd mold was 75% plaster and 25% sand. This mixture had the best fossil but was very hard to break apart. The best mixture to use in the classroom would be the 50% plaster and 50% sand.

Fossils

Fossils are made when an object is compressed in rock. It's form is kept from years of pressure. Fossils are only formed by certain types of rocks. Some creatures have very little evidence because of lack of fossils in that particular area. This form of fossil is called mold and cast.

Class Definition: Remainder of a living thing older than 5000 years. Evidence of life.
Fossils can be formed by mineral rich liquid, carbon impression, and mold and cast.

Time and Earth

The earth has been around for about 4.6 billion years. Human lifetime is only thousands of years old. The Cambrian explosion consisted of the most diverse life earth had seen.

Now that class is over I realize that diverse life ( fish, metazoans, into amphibians, reptiles, and mammals) existed only 5 million years ago.

Questions about astronomy

Which is closer to Earth in order closest to furthest?
Space shuttle------> pluto-------> stars

Space is HUGE!!!
If our solar system is as big as a quarter, the milky way galaxy would be as big as North America.
Size smallest to largest: Solar System -----> Galaxy -------> Universe

A sandbox the size of a football field four feet tall is equivalent to the amount of stars(equal to grain of sand) in the universe. If we shrunk our galaxy to the size of a CD, where would the next galaxy to us be? Marquette, UP, Michigan, United States, or world

My answer: United States

Wrong! They really aren't that far from each other. They a big and full of stars.

Where does matter come from? a) big bang b) core of earth c) interior of stars d)space between stars e) weren't created

My answer: c) interior of stars

Correct! When the Big bang happened there was no matter. 1 proton and 1 electron were created. The gas started to cluster and started nuclear fusion which created stars.