3.2 and 3.3 Lesson Review

As you read the lesson, complete each statement by writing in the correct word or words. 1. A __________ is a network of parts, elements, or components that interact with and influence one another.

• system

• atom

• molecule

• organism

Systems receive and process __________ of energy, matter, or information, and produce __________ of energy, matter, or information.

• inputs, outputs

• outputs, inputs

• sources, sinks

• flows, cycles

As you read the lesson, complete each statement by writing in the correct word or words. 3. Systems do not have well-defined __________, which makes it difficult to decide where one system ends and another begins.

• boundaries

• functions

• origins

• purposes

As you read the lesson, complete each statement by writing in the correct word or words. 4. Systems may exchange energy, __________, and/or information with other systems.

• matter

• light

• sound

• force

Inputs into Earth’s systems can include both __________ energy and geothermal energy.

• solar

• nuclear

• tidal

• chemical

An event that is both a cause and an effect is a cyclical process known as a __________, and can be either positive or negative.

• feedback loop

• linear chain

• random walk

• static state

A predator-prey relationship in which the two populations rise and fall in response to each other is an example of a __________ feedback loop.

• negative

• positive

• neutral

• direct

8. __________ feedback loops enhance stability by canceling an action once it reaches an extreme.

• Negative

• Positive

• Neutral

• Oscillating

Erosion is an example of a __________ feedback loop.

• positive

• negative

• neutral

• cyclic

Positive feedback loops are relatively __________ in nature but __________ in environmental systems that people have changed.

• rare, common

• common, rare

• common, common

• rare, rare