Define the key term: natural system made up of plants, animals and the environment.

Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite

When it is a high tide in georgia, usa, where on earth is another place that is also experiencing a high tide

Look at the photo i can’t do geography