Asap me geologists obtain indirect evidence about earth's interior by? a. measuring pressure differences at earth's surfaces b. estimating temperature inside earth c. directly looking under the many layers d. recording and studying seismic waves

D:Geologists record the seismic waves and study how they travel through Earth. The speed of seismic waves and the paths they take reveal the structure of the planet.Using data from seismic waves, geologists have learned that Earth’s interior is made up of several layers. 

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

Sorry i dont understand the question can you rephase it?