China has stopped almost all shipments of critical minerals that are needed for cars, robots, wind turbines, jet fighters and other technologies.

Global manufacturers have raised the alarm on China's decision to curb exports of rare earths alloys, mixtures and magnets. Here is an overview of rare earths and China's measures: WHAT ARE THEY? Rare earths are a group of 17 silvery-white elements.

A group representing auto suppliers in the United States called on Wednesday for immediate action to address China's restricted exports of rare earths and other minerals, warning the issue could quickly disrupt auto parts production.