Basic Quantities Worksheet • Stage 2 last modified:1/16/13

Members of your group: Using NO outside reference sources, apply the knowledge you recorded in the "Basic Quantities Worksheet • Stage 1", to determine and record "ball park" quantities for the following measurements or quantities. Include a brief indication of how (from whom, if in a group) you determined the quantities (examples: used calculator; figured out on paper; talked it out). Technical terms / concepts: latitude = north-south measurement of a sphere (like the Earth) in terms of degrees; longitude = east-west measurement of a sphere (like the Earth) in terms of degrees. Key quantity to use in estimations of global measurements: The circumference of (distance around) the Earth at its equator is a (hint!!) very convenient 25,000 miles. quantity to estimate quantity how determined How big is the US in square miles? How big is Oregon in square miles? How many degrees of longitude(=east-west) are there in a time zone? How many miles wide (east to west) is a time zone at the latitude of Portland? How many miles wide is a degree of longitude at the latitude of Portland? How many miles wide (east to west) is a time zone at the equator? How many miles wide is a degree of longitude at the equator? How big, in acres (or fractions of acres), is the lot of a typical suburban home? How big is that lot in square miles? </