An isotope is an element that has either extra or missing

When an unstable nuclei of an isotope loses energy by radiation it is called

The amount of time that it takes a sample of unstable nuclei (of a radioactive isotope) to decay by half is called

The outermost chemical layer of the Earth is called the

The mechanical layer of the Earth that is represented by the presence of tectonic plates is the

Which of the following elements IS NOT present in the core of the Earth?

The INNER CORE of the Earth is

Which mechanical layer of the Earth is represented by the flow of liquid metal?

The chemical layer of the Earth that is represented by plastic-like, semi-solid rock is the

Why is the core of the Earth represented as one layer (rather than inner and outer core) when presented as a chemical layer?

Which mechanical layer of the Earth is defined by the presence of convection currents?

The mesosphere is different from the asthenosphere in that

The process by which dense material sank to the center of Earth and less-dense material rose to the top of the Earth when it formed is called

Which mechanical layer of the Earth is responsible for creating Earth's magnetic field?

Which of Earth's layers is represented by #6?

Which of Earth's layer's are represented by #4?

Which of Earth's layers are represented by #2?

How old is a sample with a 1:3 ratio of Carbon-14 to its stable daughter isotope?

How old is a sample that contains a 1:7 ratio of Plutonium-239 to its daughter isotope?

HONORS ONLY: The daughter isotope of Carbon-14 is Nitrogen-14. How old is a sample that contains 96.875% Nitrogen-14?