Basic Quantities Worksheet • Stage 2 last modified:1/23/12

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. 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 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?