Convection occurs because: A. Small earthquakes occur within the Earth's crust causing rocks to shake and change temperature.

B. Oceanic crust is being destroyed at deep ocean trenches.

C. Molten rock comes close to the Earth's core it heats up, becomes less dense and rises and the molten rock near the Earth's crust cools down becomes more dense, and sinks causing the cycle of convection.

D. Convection does not occur within the Earth.

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

Zoe decided to measure the hand length of each of her classmates. first she marked a line across each student's wrist and lined up a ruler from this mark to the top of the middle finger to measure the length. then she recorded the measurements in the table below. marla did this the same way for each classmate, and then zoe used this ruler to measure each straight line and record the data below. this data is invalid. what is the most likely reason why it is invalid? the ruler is marked in centimeters, but zoe recorded data in inches. the range of lengths is too wide, so zoe must have misread the ruler. marla’s complicated measuring procedure was overly confusing. marla could have been inconsistent while drawing outlines of fingers.

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