Observation of size and shape on diffusion rate Table 2 Figure/Shape Draw the shape Dimensions in centimeters Area (cm2) Time in minutes
Big circle: 8 cm diameter 50.24 cm2 11 minutes
Big rectangle: 5 cm x 10 cm 50 cm2 16 minutes
Big square: 6.2 cm x 6.2 cm 38.5 cm2 14 minutes
Small circle: 6 cm diameter 28.26 cm2 8 minutes
Small rectangle: 4 cm x 7 cm 28 cm2 10 minutes
Small square: 4.39 cm x 4.39 cm 19.6 cm2 9 minutes
1. Describe what happened to the filter paper figures in the colored water over time. What is this process called?
The color started up the flap and started to dye the filter paper from the center outward. It is called diffusion.
2. Which figure took:

a. the longest time?
b. the shortest time?
3. According to your calculations, how did the area of the different figures compare?
4. Did the shape of the paper affect the results?

Our planet has experienced five major extinctions in the four billion year history of life. the first, 450 million years ago, occurred shortly after the evolution of the first land-based plants and 100 million years after the cambrian explosion. the second extinction occurred 350 million years ago, causing the formation of coal forests. next earth experienced two mass extinctions during the triassic period, between 250 and 200 million years ago. the fifth mass extinction occurred 65 million years ago, ending the reptilian dominance of the earth. according to richard leakey, the sixth mass extinction is happening right now. leakey suggests that we, the human race, are the cause. each year, at our hand, approximately 50,000 species vanish from earth. he believes that man is destroying earth at a rate comparable with the impact of a giant asteroid. leakey's statistics indicate that 50% of earth's species will become extinct within the next 100 years assuming leakey's hypothesis of a sixth mass extinction to be true, how will we expect the model to change? a) a sharp spike in the graph approximately 100 million years from now b) a dip in the graph, followed by a sharp spike about 100 million years from now c) a sharp spike in the graph immediately following the "0" location of the x axis d) a plateau following the "0" mark on the x axis, followed by a gradual rise to a new peak