What are 2 popular ideas of what cause fluctuations?

[fw.02]diana is studying four surface features of florida. she classifies the surface features and places them in different columns of a chart as shown below. surface features column 1 column 2 hot springs sinkholes caverns geysers which of these titles best represents column 1 of diana's chart? formed by freezing groundwater o formed by heating groundwater o formed by evaporation of groundwater o formed by chemical action of groundwater

The meseta in spain is a a. navigable river b. castle c. coastal plain d. plateau

Which layer surrounds the center of the earth? a: crust b: core c: mantle