1. You and a friend are hiking through a canyon. You tell your friend that the rock layers in the canyon are all different ages, and you can tell which rock layers are the oldest and which are the youngest. She picks four different rock layers on the canyon wall, as shown in the
photograph
Which layer is the youngest?

A. Layer 1
O B. Layer 2
C. Layer 3
D. Layer 4

its number 4 D layer 4

Explanation:

just look at it look at the colors so that's how you know and plus it just old

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.