4. next discuss how dr. knappe used technology to measure how fast the tectonic plates are
moving apart. what devices did she use?

She used the Global Positioning System.

Explanation:

The Global Positioning system sends the signal to the ground station via satellite. Through this, the distance between the ground station and the satellite is measured. That's how the movement is measured. If the tectonic plate moves a little bit, the distance will be changed. That's how Dr. Knappe measured the movement of the tectonic plates.  

u can delete ur account.

1. go on google and write

2 open this and click on your profile pic and if your profile is not appearing, then u have to log in.

3. when u click on your profile pic, there appears four options on the top.

4. click on the 1st option and scroll down and go at the bottom.

5. click on edit profile.

6. there appears a option 'prefernces' and at that option at the right side , 'edit' is written.

7. click on the edit option.

8. there is a option " i want to delete my account" and click on that.

hope this u

and ur welcm

: )

no. dot product   =0 when vecs at right angles