Warm Up 9/20 What is any size group of interacting parts that form a complex whole called? System What are the two sources of energy for the Earth system? The sun and Earth’s interior Which of the following is NOT caused by human interactions with the Earth system? Air pollution c. Mountain building Water pollution d. Deforestation Mountain building

What is Scientific Inquiry? Chapter 1, Section 5

Hypothesis All science is based on two assumptions: (1) the natural world behaves in a consistent and predictable manner, and (2) through careful, systematic study, we can understand and explain the natural world’s behavior The development of new scientific knowledge involves some basic steps; first, scientists collect data through observation and measurement Once data have been gathered, scientists try to explain how or why things happen in the manner observed Hypothesis – a tentative explanation that is tested to determine if it is valid Before a hypothesis can become an accepted part of scientific knowledge, it must be tested and analyzed

Theory When a hypothesis has survived extensive testing and when competing hypotheses have been eliminated, a hypothesis may become a scientific theory Theory – a well-tested and widely accepted view that explains certain observable facts

Scientific Method The process of gathering facts through observations and formulating scientific hypotheses and theories is called the scientific method Although the scientific method may vary, most investigations contain the following steps: The collection of scientific facts through observations and measurement The development of one or more working hypotheses or models to explain these facts Development of observations and experiments to test the hypotheses The acceptance, modification, or rejection of the hypothesis based on extensive testing

Assignment Read Chapter 1, Section 5 (pg. 23-24) Do Section 1.5 Assessment #1-8 (pg. 24) Study for the Chapter 1 Quiz!