How many oxygen atoms are in 3.00 g of sodium dichromate, Na2Cr2O7?

What is the oxidation number change for the manganese atom in the following unbalanced reduction half reaction:

Imagine the current working directory of your terminal is the root directory of a git repository on your laptop. All of your changes have been committed to the repository but github.com does not have all of your commits yet. Give the terminal command to get all of the changes on your laptop to the corresponding repo at github.com.

Ripples are the result of

Groundwater can come from water trapped in the rock when it was made, or from

What percent of radioactive 87Rb will still be present (i.e., NOT have decayed to 87Sr) after two (2) half-lives have passed?

Major oceanic surface currents travel

According to the following image, after one (1) half-life has passed, what is the ratio of parent isotopes to daughter isotopes (P:D)?

Shorelines migrate (move) __________ during a transgression and __________ during a regression.

Phyllite is of lower metamorphic grade than schist.  Another difference between phyllite and schist is that