Answer:
Magnetic reversals - Evidence suggests that the earth's magnetic field has periodically reversed its polarity in the past. ... Small magnetite crystals in a cooling lava flow act like tiny compass needles, preserving a record of the earth's magnetic field when the lava solidifies.
Answer:
Ozone depletion means that more of the sun's rays can reach earth. One particular troublesome ray is UVB radiation. It has many harmful effects on humans which include:
- DNA damage
- Melanoma
- Other skin cancers.
- Cataracts
- Immune system problems.
Even when humans are not affected directly, we are indirectly affected by the planet being affected. For instance, ozone damage leads to less agricultural productivity as well as adverse effects on aquatic life. Humans rely on both of these for food so ozone depletion is targeting our food sources as well.
True !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
The Orpheus theory, which says that a planet-sized body once collided with Earth and that it sent some of the material into orbit, forming the moon.