Grammar mistakes in a PhD application
There is certainly no way that these mistakes alone will hurt your application.  If the admissions committee is concerned about your English fluency, there are other things they can look at: your GRE and/or TOEFL scores and your personal statement / statement of purpose.  If you are doing okay on those, then you have nothing to worry about.  

Even if your verbal / writing / English skills do look somewhat shaky, that still should not get your application for a PhD in earth sciences automatically tossed out.  The committee would want to weigh your weaknesses there against your strengths in other areas.  What would be a problem is if your writing skills were so poor that they just couldn't understand you at all.  Based on the five line writing sample given by your question: this is absolutely not going to be the case.

In summary: don't worry, you should be fine.