| A | B |
|---|
| trench | the part of the ocean that is a deep narrow valley |
| Ocean | large body of salt water |
| salinity | saltiness of the ocean |
| brackish | caused by the wind |
| continental shelf | part of the ocean where people swim |
| abyssal plain | deep , flat area of ocean floor |
| tides | pull of the moon and the sun on the earth |
| mid ocean ridges | large mountain chains that run laong theocean floor formed from volcanic activity |
| weathering | breakdown of rocks into sediments |
| geology | study of the earth |
| weathering | breakdown of rocks into sediments |
| magma | hot molten rock inside the mantle |
| fossil | physical evidence of living things from the past |
| minerals | rocks are made from a mixture of these |
| pangea | the supercontinent |
