Which three observations are caused by plate tectonics? Similar fossils are found in Australia, Africa, and Asia.
Earthquakes occur frequently on the west coast of the United States.
An ocean current flows northward along the east coast of the United States.
There is a long string of underwater volcanoes in the Pacific Ocean.
The sand dunes in the Sahara Desert in Africa move across the landscape.

Can anyone explain 1. review your spectrometry data and use the known elements to identify the star's composition. which unknown elements make up this star? justify your element selections. 2. in parts i and ii of the lab, what happened to the electrons of each element to produce the different colors of light? explain your answers using important terms from the lesson and information provided in the laboratory. 3. stars composed of heavier (more massive) elements are often slightly older than stars made predominantly from hydrogen and helium. based on your data, is the newly discovered star a younger star? explain your answer.