True or false: 1. Over time, sand becomes limestone, clay-sized sediments become shale, and carbonate sediment becomes sandstone
2. At the end of the Proterozoic , the only part of Laurasia above sea level was the south American shield
3.large, sandy beaches formed on Laurasia as sand-sized fragments of quartz were weathered from Cretaceous rocks

What was dr. willem johan kolff’s first step in using the scientific process to invent the hemodialysis machine? he built the machine and tried it with various patients, collecting data about its effectiveness. when a patient’s kidneys failed, he wondered if it would be possible to perform kidney functions with an external machine. he researched and collected data about numerous patients who exhibited symptoms of kidney failure. he drew conclusions from studies of various symptoms of kidney failure, and drew a design for the ideal external blood-processing machine.

Facilitates growth and change in neurons and the migration of neurons to different sites in the brain

How many years would it take the atlantic ocean to grow 500 centimeters? show your work.