A student is performing experiments on a particular substance. Which statement is an observation of a chemical property of the substance?
O A. It burns.
B. It melts.
O C. It floats.
D. Electricity cannot pass through it.

We all use gps today, even if we don't drive yet. i bet you have been in the car with a parent and they have asked you to get out your phone to find a specific location. in your car, on the phone, you are using a very sophisticated technology. gps satellites circle the earth twice a day in a very precise orbit and transmit signal information to earth. gps receivers take this information and use trilateration to calculate the user's exact location. essentially, the gps receiver compares the time a signal was transmitted by a satellite with the time it was received. the time difference tells the gps receiver how far away the satellite is. now, with distance measurements from a few more satellites, the receiver can determine the user's position and display it on the unit's electronic map. what type of signal is utilized by the gps satellite?

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of