When did Pangaea begin to break apart?

a. 20 million years ago

c. 250 million years ago

b. 100 million years ago

d. 2 billion years ago.

Gerald's science teacher mixed room temperature samples of hydrochloric acid and sodium hydroxide in a large beaker.

In a flashlight, many parts work together as a system. which of the following parts is considered the output in this particular system? A. the switch B. light C. the light bulb D. the batteries

What is the percentage of radioactive nuclei left after 3 half lives pass?

What indicates a chemical reaction has occurred?

What is the basic unit of energy?

Zn (s) + 2HCl (aq) → ZnCl2 (aq) + H2 (g) When combining zinc metal with hydrochloric acid, you notice that you run out of zinc and still have plenty of hydrochloric acid to continue the reaction. What is the term used to describe the zinc?

Engineers increase output in crop production by combining the strengths of two plants. This can be done by using one plant to pollinate a different plant so that their strengths are combined into a new plant. What is this technique called?

Using the first volume and temperature reading on the table as V1 and T1, solve for the unknown values in the table below. Remember to use the rules of significant figures when entering your numeric response. A: B: C: D: A 2-column table with 5 rows.

Which scientist performed the cathode ray experiment leading to the discovery of electrons

Why does the temperature remain constant during melting till all the ice has melted?