The page introduces the theory of plate tectonics, explaining how it accounts for the Earth's geological features and changes over time. It highlights the difficulties in the theory's acceptance due t...The page introduces the theory of plate tectonics, explaining how it accounts for the Earth's geological features and changes over time. It highlights the difficulties in the theory's acceptance due to lack of a driving mechanism for continental movement and geographic biases among early 20th-century geologists. The text also outlines learning objectives related to understanding different plate boundaries, the driving forces behind plate movements, and California's plate boundaries.
This page explains the formation of igneous rocks from molten magma, highlighting the distinction between intrusive and extrusive varieties. It discusses volcanoes as major landforms shaped by extrusi...This page explains the formation of igneous rocks from molten magma, highlighting the distinction between intrusive and extrusive varieties. It discusses volcanoes as major landforms shaped by extrusive lava, and notes that magma can create intrusions when solidified underground. The page also covers geothermal features like hot springs and geysers, providing examples such as the Columbia Plateau and Old Faithful.
