Why can't I erase HD with Disk Utility?

I have a MBAir 11" with Mavericks. I want to erase the HD. I go to Disk Utlity>choose Macintosh HD>Erase. All choices are greyed-out (Format, Name, Erase Free Space, Security Options, Erase). I can't choose anything. What am I missing?

Hi Loner T,
Here is what I get.
I'll also put a picture up of what I'm seeing in disk utility...
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.1 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage                         499.2 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Untitled               *498.9 GB   disk1
                                 Logical Volume on disk0s2
                                 4306F405-E4CD-46A4-A31E-7D7BC1199F32
                                 Unencrypted
/dev/disk2
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.1 GB   disk2
   1:                        EFI EFI                     209.7 MB   disk2s1
   2:          Apple_CoreStorage                         499.1 GB   disk2s2
   3:                 Apple_Boot Recovery HD             784.2 MB   disk2s3
Chris-Prendergasts-MacBook-Pro:~ chrisprendergast$

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