enviornmental science chapter 2

setting up experiments

• Test a single variable

• Controls (comparison)

• Multiple trials

• Publish so others can prove (agree), disprove, or improve

Experiment

independent variable 

• Changed to test the prediction (hypothesis)

  • Plotted on the x

• Plotted on the y

what is the goal of a controlled experiment

to test for 1 variable

why might a scientist repeat work already done by others

to prove, disprove, or approve

what is the difference between a control and experimental group

controlled experiment : missing variable

experimental: one with variable

Bar graph

pie graph

line graph

5 steps to our scientific method

Problem

Hypothesis

Experiment

Conclusion

Theory/law

Please have extra Credit Teacher

where do you plot the independent/ dependent variable

independent = x

dependent = y

5 abiotic factors

air

water

soil

temperature

wind

5 biotic factors

humans

animals

plants

indects

fungi

why is science uncertain and unchangeable

new ideas, technology, instruments

why is enviornmental science an integrated science

many fields

what tools or equipment can help enhance a scientists senses

microscopes, beakers and test tubes, Bunsen burners

geiger counter

looks at radio activity

3 challenges scientists go through today

curing nd preventing diseases, world hunger, technology

hypothesis

a possible explanation for a set of observation

variable

any factor that affects the outcome of an experiment

biotic

all living parts of the enviornment

abiotic

all non living parts of the enviornment

enviornment

everything that surrounds an organism

control

group would have all of the factors that were there when the original observation were made

read story at the end of notes

.

science

pieces up together all of the clues (data)

hypothesis

educated guess

possible solution

what might cause a scientist to change a hypothesis

based on the info on some of the experiments/ new info might change hypothesis

what caused scientists to change their ideas about cellular structures

the invention of microscopes

every investigation starts with a

problem/observation

the process of developing a hypothesis

prior experience/ research

enviornmental science

studies everything around us

fields of enviornmental science

biology, ecology, chem, geology