abeka Science earth and space chapter 1

reusing old materials

reasoning from evidence to a more specific conclusion

Any collected water below the soil's surface

a model of a design that is used for testing

Provides a standard of comparison for soil identification

element in soil that valuable to the plant when its fruit is ripening because it makes fruits "firm up" properly

When a hypothesis has been tested by other scientists through the same or different experiments with the same results

element in soil that primarily functions to contribute to the general health of the plant and improve disease resistance

variable that is observed during the experiment

material derived primarily non living matter like rocks and minerals

bacteria in soil that returns nitrogen in the soil back to the atmosphere

group on which a test is performed

a statement of fact

layer of soil that is not as dark as top soil because it contains less organic material and more mineral material

scale that indicates the basidity and acidity of a material

a fallacy that occurs when a scientists assumes a change in one factor caused a change in another factor

a group of chemicals containing the element phosphorus bonded to oxygen and other elements

a collection of ground water held in by layers or porous rock or a gravel soil mixture that can hold water

top layer of soil that contains the most nutrients

one of the three main components of the scientific method

ability to repeat an experiment many times and get the same results each time

a substance composed of decayed organisms' particles

the upward movement of water through a tiny space in response to surface tension

layer of solic rock that shields the earth's crust from weathering

variable that is changed to test your hypothesis

the study of reasoning

group in which the independent variable is not present

the substance of the physical world

reasoning from specific evidence to a more general conclusion

substances containing atoms of two or more elements bonded together

the study of soil

a conclusion based on reasoning from evidence

bacteria in soil that converts nitrogen into ammonia, nitrates, and other compounds

element in soil that stimulates rapid growth of leaves, giving plants a rich gree color

nourishing substances

variables that are kept the same for all groups

process of nitrogen moving from the air to the soil, used by plants, and returned to the atmosphere to be used again