What are small pieces of the earth’s crust that float on the liquid mantle are called?

tectonic plates

Explanation:

    The earth's crust - the outermost layer of planet Earth, formed by rocks - is subdivided into several “pieces”, which, despite being separate, are always in contact with each other. The set of these pieces is called tectonic plates.

    Tectonism - also known as the movement of plate tectonics - has transformations that can be directly perceived by people on the earth's surface, such as earthquakes, the movement of continents, the formation of volcanoes and also the appearance of mountains.

which elements do geologists measure to determine the age of an organism’s remains? check all that apply.

carbon-14

nitrogen

carbon-12