It looks as though they used steel reinforcement rods to support the sink area. The steel rods expand when they get wet and can split the granite. Most fabricate is use fiberglass reinforcement now.
You can fill the crack and polish it smooth but will never be able to make it not noticeable. 

Sent from my iPhone

On Mar 12, 2015, at 10:13 AM, Stuart Young <Santafefc@sbcglobal.net> wrote:

Hello Everyone,

Any ideas on how to repair these cracks?

Stuart
Santa Fe Floor Care

Begin forwarded message:

From: Rahul Kurane <rahul.kurane@gmail.com>
Subject: granite countertop crack pictures
Date: March 11, 2015 3:16:36 PM CDT

Hi Stuart,

We spoke a few min ago regarding a crack in my granite countertop that I need to get repaired. You had asked for pictures to get a better idea of what the crack looks like. They are attached below. My personal information is as follows -

Name: Rahul Kurane 
Address: 1501 Cutting Horse Lane, Austin - 78727
Phone #: 512-832-7939

Thanks,
Rahul

<IMG_6669.JPG><IMG_6670.JPG><IMG_6671.JPG>

 
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