While it may seem rare with well known abundance of female deities that deal in nature based roles there are plenty of gods who also take their place in environmental spheres. What is rare, however, is to find a god of the Earth, as opposed to the far more common goddess of the Earth. The most popular and widely known God of the Earth is Geb.
This Egyptian god is likely a deity that many are likely familiar with and that's why we'll start with the most popular story of him. Geb is the son of the god of air, Shu, and Tefnut, the goddess of moisture. Shu and Tefnut, both created by Amun (the original form of sun god, Ra), were also the parents of Nut, the sky goddess (whom we covered several Daily Deities back.) Eventually Nut and Geb end up in a relationship. This is mythology things like that tend to happen. In truth, their relationship wouldn't have been an issue if Amun wasn't so concerned with losing his role as head of the pantheon. Amun know that he could control those already around, but he wasn't convinced that new gods would be willing to follow along with his rule.
So Amun told Shu, who had his own issues with Geb and Nut, to separate the pair. Shu then used all his might to generate the strongest wind he could form to push Geb and Nut apart. In many tellings, Shu stood atop Geb while he pushed Nut high into the sky. Nut was stretched out over the Earth, her entire body becoming the sky. Geb, on the other hand, was laid out far below her and became the Earth himself. The two have not been in contact since. However, their union was not fruitless. Geb and Nut are the parents of five of the most important gods in Egyptian mythology: Osiris, Isis, Set, Nephthys, and Horus (at least the first one.) After this whole fiasco towards the beginning of time, things relaxed between Geb and Ra (as well as Ra and Nut.) While Geb likely mourned his separation from Nut, he did eventually seem to get over his hurt feelings and turn his attention towards his role.
Geb is an interesting god. Many sources stop his story after he and Nut are separated, but Geb did quite a lot after this. First off, we'll discuss his appearance, as that is a critical aspect of many Egyptian deities. Geb is described and depicted as either green or a rich dark brow. With either base color, Geb was also seen with leaves covering his flesh much like the way that Nut was depicted as blue with stars dotting her skin. As well, like Nut's entire body representing the starry night sky, Geb's body is representing his role as both an Earth god and fertility. With Earth gods, fertility is relating to the ability of a land to grow crops. For thousands of years when the Nile flooded its banks and nourished the fields there would be great crops formed, and Geb was often honored for this.
Like the majority of the Egyptian pantheon, Geb is associated with an animal. For Geb, he has a goose, of which it I would assume is an Egyptian goose. He is sometimes depicted with a goose head like Thoth or Horus, but more commonly he is seen with a goose sitting atop his head. Oddly enough, Geb's connection with geese expands from them just acting as his sacred animal. There is one story about Geb that is quite possibly the weirdest thing about him. He was said to have laid an egg. No one's completely sure how he managed that, but he's a god so I suppose he would have the ability to do whatever he wanted. This egg is often related to the "World Egg", the egg from which all things were said to originate from, or the Ogdoad, the set of eight gods that created everything before the beginning of time.
Egyptian mythology often has this trend of taking two gods from basically the opposite of the timeline of mythology and saying they are the same gods. Likely, this occurred because the gods of Egypt and the Ancient Egyptian civilization were around for so long that over time it just was easier to consolidate some gods down. This happened in a lot of places, but one of the easiest places to see the transformations is in Egyptian mythology. Just look at Ra's transition from Amun to Ra to Khepri.
That being said, I have no doubt that Geb laid an egg. It just wasn't the World Egg, and it's probably good that it wasn't. Geb was also responsible for creating earthquakes just by laughing. With all the odd antics of the Egyptians and their original appearances he probably had a good deal to laugh about. Even though it's terrible the damage that earthquakes wrought on people, it's kind of nice to have a god that makes earth quakes through laughter instead of intense rage or horrible agony.
As stated earlier, Geb's story usually gets cut off after the birth of his and Nut's children, but Geb has more to his story. Of all the myths in Egyptian mythology the fight between the falcon-headed god Horus and his chaos-wielding uncle Set for rule over the Egyptian pantheon is probably the most famous. There is, of course, quite a lot of details and events within this one story that we won't get into right now, but we do need to address Geb's role in the story. One of the most essential points to know is that Geb was one of the many rulers of the Egyptian gods. He took that role from Shu, who took that position from Ra. Like his predecessors, Geb eventually gave up his spot as king and he was the one who passed the crown to Osiris. During this time, after Osiris's death, Geb also becomes associated with the Underworld most likely because Osiris became King of the Underworld.
After this we have Set taking over, disposing of Osiris twice, and causing tons of problems for Horus and Isis and several other gods who were strictly loyal to Horus, Osiris, and Isis. By this time Ra, who technically was still the top of the pantheon, was already pretty isolated and no longer concerned himself with what the rest of the pantheon was doing. This means that for the majority of the fight between Horus and Set there was no referee and this battle got bloody.
It did take some time, but eventually Geb decided that enough was enough and that he needed to intervene. Geb knew his family well and decided to give Horus Lower Egypt and Set Upper Egypt. At what point in the story this was is unknown, but it's likely some part in the middle since Horus did eventually become the king of all the gods and of all Egypt with Geb's consent.
Overall, Geb's an interesting god. He, like many of the other Earth gods of the world, is the parent of some of the most essential immortals in a pantheon and this has greater meaning then some would realize. Geb's relationships with those gods, and with all the other aspects of himself, show the importance of the Earth, of how we all come from the Earth, both god and mortal alike. So, even though he stands out for being one of the few male Earth deities in the world, Geb also stands out just by being the god he is.