Science
Earth
Ecosystems
Biomes
Populations
100
This method consists of a series of steps used by scientists to identify and answer questions.
What is the experimental method
100
Earth's thin outer layer.
What is the crust?
100
This is the intial source of food in most oceanand freshwater systems.
What is phytoplankton?
100
On new islands formed by volcanic activity, you will most likely find __________ succession
What is primary?
100
An adequete supply of firewood helps prevent disease by allowing water to be boiled to ______________ it
What is sterilize?
200
This procedure is used by scientists to test a hypothesis.
What is the scientific method?
200
This form of oxygen is found in the upper atmosphere and protects Earth from the sun's ultraviolet rays.
What is ozone?
200
A mushroom in the ____________ structure of a fungus.
What is reproductive?
200
This is the percentage of energy that is passed from one trophic level to the next
What is 10%?
200
One way to stabilize the world population is to reduce _____________ rates by improving womens status and educational opportunities.
What is fertility?
300
One step in the decision-making model is to explore both positive and _________________ consequences.
What is negative?
300
The measure of the quantity of dissolved salts in sea water.
What is salinity?
300
The first land plants were small and had to live in damp places. Their modern descendants are small plants known as _______________________.
What is mosses?
300
Underground carbon sources composed of plants and animals that died millions of years ago are __________.
What are fossil fuels?
300
A population's growth rate is its __________ rate minus _________ rate
What is birth and death?
400
In an experiment the ________ group is the group that recieves the experimental treatment.
What is experimental group?
400
Small streams and rivers that flow into larger ones are called_____________
What is a tributary?
400
_______________________ are plants that produce seeds that are not in fruit.
What are gymnosperms?
400
In the carbon cycle, the source of carbon for producers is
What is atmosphere?
400
A population's ______ is the number of its members per unit area or per volume.
What is density?
500
A _______________ can explain an observation and predict what might happen in the future.
What is a theory?
500
During _______________, liquid water is heated by the sun and then rises into the atmosphere as water vapor.
What is evaporation?
500
Animals that have a backbone are called _________________.
What are vertabrates?
500
Barnacles are a type of _________, or bottom dwelling organism.
What is benthos?
500
The ____________ of an ecosystem for a particular species is the maximum population that the ecosystem can support indefinitely
What is carrying capacity?
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