They were first dug in 1914.
A volcanic eruption is what most scientists believe created the Richat Structure. Hope this helps.
True
The Jesuits were expelled by King Charles III and replaced by the Dominican Order. Orders for General José de Gálvez were to "Occupy and fortify San Diego and Monterey for God and the King of Spain." Between 1769 and 1833 twenty one Spanish missions in California were established.
