Hi, I need help with 2 questions!

 Which type of underground magma formation is usually dome shaped?
dike
laccolith
sill
batholith

Laccolith is my answer.

Scientists want to protect a beach from erosion. What can they do?

I don't know this one. I am not sure what they can do. Can you help me please?

3 answers

http://www.dictionary.com/browse/laccolith

so I agree.
by blocking the wind from blowing the sand till its eroded? IDK. (I dont want anyone knowing my name, so i put @)
I found this, mabey it will help; Breakwaters are barriers built offshore to protect part of the shoreline. They act as a barrier to waves, preventing erosion and allowing the beach to grow. The dissipation of wave energy allows material carried by longshore currents to be deposited behind the breakwater. This protects the shore.