Word Bank: microscope, rivers, physical, space, glaciers, weathering, elements, analog, topographic map, NASA, satellite, deposition, landforms Earth's sulface and it's landforms are always changing. Scientist can use tools such as teachnology in order to photographt these changes from . The picture are then studied in order to identify changes to the land over time. The changes due to events such as the of sediment, the movement of , and courses of can be observed by viewing a series of topographic maps or satellite views that were taken over a period of time.​

Explain how scientists use geologic time to determine the age of landforms.

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Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.