Gravity is the force that keeps us attracted to objects with a larger mass than us. Earth has so much mass that we are stuck to it. If we jump up, we come down. If you throw a ball up in the air, it will come down unless you throw it with such force that it escapes the pull of the earth. Many things are caused by gravity.
I’m pretty sure the answer is B
A pearl harbor that was what led the U.S. to join WWII
<span>The most approprate answer is a. water. Although over 70% of the earth's surface is water, only a small percentage is fresh water that is suitable for domestic purposes. The high rate of pollution and the over use of groundwater resources can use water faster than it can be replenished. Some rivers and lakes can become so polluted that they cannot be used for domestic or even agricultural purposes. </span>
Answer:
The most recent eon is subdivided into three eras and eleven periods.
Explanation:
The geological time scale has been constructed so that it can help in better research and understanding of the past, as well as making it easier to distinguish the past and its characteristics at a certain time. There are larger and smaller divisions in the geologic time scale, with the eon being the largest unit, followed by era, and then period.
The most recent eon is the Paherozoic, starting from 542 million years ago and still going on. It is subdivided into three eras and eleven periods so far. The three eras are:
- Paleozoic
- Mesozoic
- Cenozoic
The eleven periods are:
- Cambrian
- Ordovician
- Silurian
- Devonian
- Carboniferous
- Permian
- Triassic
- Jurassic
- Cretaceous
- Tertiary
- Quaternary