Study the timeline. a timeline. 4.5 billion years ago, earth is formed. 4.3 billion years ago, earliest water. 4.1 billion years ago, single celled life. 3.5 billion years ago, earliest oxygen and photosynthesis. 2.5 billion years ago, complex single celled life. 1.5 billion years ago, multi cellular life. 500 million years ago, land life. 300 million years ago, dinosaurs. 200 million years ago, mammals. 130 million years ago, flowers. 5 million years ago, humans. which statements indicate what the fossil record suggests about evolution on earth? check all that apply. humans have only recently existed on earth. organisms originally lived only in earth’s water. life on earth started when water formed on earth. plants did not have flowers when dinosaurs existed. multicellular life evolved before complex single-celled life

What volcanoes form on a divergent plate margin

If the basis of an isosceles trapezoid have lengths of 11 and 26, what is the length of the median?

Study guide for unit 2 ~ lesson 3 ,4, & 5 test, thursday, january 24th lesson 3 vocabulary erosion - deposition - landform- weathering- short answers 1. how do volcanic islands form? 2.why is deposition likely to occur outside a river bend? 3. in what conditions does soil form fastest? 4. which 2 earth’s systems interact to form a coral island? 5. a beach growing in size is most likely the result of 6. which type of islands are formed when a chunk of land breaks off from a larger landmass? long answers explain how plants can grow in small cracks of rock that do not appear to contain soil. lesson 4 vocabulary pollution - toxic - short answers 1. most farmers pollute soil by purposefully adding 2. what is the benefit of contour plowing? . 3. using nuclear power to produce electricity can cause water pollution by 4. why do scientists predict humans will run out of fossil fuels someday? 5.farmer spray crops with fertilizer and weed killer to the crops grow. how might this affect the hydrosphere? list two different ways you use fossil fuels. 1- 2- what are two other energy sources scientists and engineers are researching? 1- 2- lesson 5 vocabulary decompose- recycling - short answers 1. which of earth’s systems do you interact with when you wash your hands? 2. which of earth’s systems is polluted by exhaust gases from buses pollute? 3. why is it important to dispose of electronic devices properly? 4. where do people interact with all four of earth’s systems?