Dimensions of the Earth

This unit consists of a variety of materials that explain the shape of the Earth and how it is measured. There is a set of 'proofs' that the Earth is round, an account of how Greek geographer and mathematician Eratosthenes deduced that Earth's surface was curved, and explanations of how roundness, latitude, and longitude are measured. There is also information on time zones, contour (isoline) maps, topograpic profiles, and map projections. A vocabulary list and downloadable, printable worksheets for each major topic are provided